Alcohol By Weight Calculator: Precision Measurement Guide
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Calculation Results
— %
Total Liquid Mass: — g
Total Alcohol Mass: — g
Total Water Mass: — g
Calculated Liquid Density: — g/mL
Formula Explanation:
Distribution of Mass Components at Different Alcohol Concentrations
Component
Mass (g)
Percentage of Total Mass
Alcohol
—
— %
Water
—
— %
Total
—
100 %
Mass breakdown based on ABW calculation.
What is Alcohol By Weight (ABW)?
Alcohol By Weight (ABW) is a metric used to express the alcoholic strength of a beverage by measuring the weight of pure alcohol (ethanol) present relative to the total weight of the beverage. Unlike Alcohol By Volume (ABV), which measures the volume of alcohol, ABW provides a different perspective that is particularly relevant in certain industrial, regulatory, and scientific contexts, especially in brewing and distilling. While ABV is the standard for most commercial beverages (like wine and spirits), ABW offers a more precise mass-based understanding.
Who Should Use It? ABW calculations are crucial for brewers, distillers, and anyone involved in precise beverage formulation, quality control, and compliance. It's also used in scientific research involving ethanol and its properties. For consumers, understanding ABW can offer a deeper insight into the composition of their drinks, though ABV remains the more commonly advertised figure.
Common Misconceptions: A primary misconception is that ABW and ABV are interchangeable. They are not. Due to the different densities of alcohol and water, the ABW percentage will always be lower than the ABV percentage for the same beverage. For instance, a 40% ABV spirit will have a significantly lower ABW percentage. Another misconception is that ABW is irrelevant; however, for mass-based processes and certain regulatory bodies, it's the preferred or required measurement.
Alcohol By Weight (ABW) Formula and Mathematical Explanation
Calculating Alcohol By Weight (ABW) requires understanding the densities of alcohol and water, and how they contribute to the total mass. The fundamental formula is:
ABW (%) = (Mass of Alcohol / Total Mass of Liquid) * 100
To apply this, we need to determine the mass of alcohol and the total mass of the liquid, which is the sum of the mass of alcohol and the mass of water (assuming the liquid is primarily ethanol and water).
The mass of each component can be calculated using its volume and density:
Mass = Volume × Density
Therefore, the steps involved are:
Calculate Mass of Alcohol: Use the given Volume of Alcohol (which is often derived from the input ABV and total liquid volume) and the density of pure ethanol.Calculate Mass of Water: Determine the volume of water by subtracting the volume of alcohol from the total liquid volume. Then, use the density of water.Calculate Total Liquid Mass: Sum the mass of alcohol and the mass of water.Calculate ABW: Divide the mass of alcohol by the total liquid mass and multiply by 100.
The densities of alcohol and water are temperature-dependent. Accurate calculations may require using density values specific to the beverage's temperature. Our calculator uses typical values but allows for adjustments.
Variables and Their Meanings:
Variable
Meaning
Unit
Typical Range
Volume of Alcohol (Valc )
The volume of pure ethanol in the liquid.
mL
Depends on total volume and ABV
Volume of Water (Vwater )
The volume of water in the liquid.
mL
Total Volume – Volume of Alcohol
Density of Alcohol (ρalc )
Density of pure ethanol at a given temperature.
g/mL
~0.789 g/mL (at 15.56°C)
Density of Water (ρwater )
Density of water at a given temperature.
g/mL
~1.000 g/mL (at 4°C), ~0.999 g/mL (at 15.56°C)
Mass of Alcohol (Malc )
The weight of pure ethanol in the liquid.
g
Valc × ρalc
Mass of Water (Mwater )
The weight of water in the liquid.
g
Vwater × ρwater
Total Mass (Mtotal )
The total weight of the liquid.
g
Malc + Mwater
Alcohol By Volume (ABV)
Percentage of alcohol by volume.
%
0-100%
Alcohol By Weight (ABW)
Percentage of alcohol by weight.
%
Typically lower than ABV
Temperature
Temperature of the liquid, affecting density.
°C
Common range for beverages
Practical Examples (Real-World Use Cases)
Let's illustrate with practical examples for calculating Alcohol By Weight (ABW).
Example 1: Brewing a Craft Beer
A brewer is making a batch of craft beer with an estimated final Alcohol By Volume (ABV) of 6.0%. They want to know the ABW for regulatory reporting.
Inputs:
Liquid Volume: 19,000 mL (approx. 5 US gallons)
Alcohol Concentration (V/V): 6.0%
Temperature: 20°C (typical room temp)
Assume standard densities: Alcohol Density (ρalc ) ≈ 0.789 g/mL, Water Density (ρwater ) ≈ 0.998 g/mL at 20°C.
Calculation Steps:
Volume of Alcohol (Valc ) = 19,000 mL * 6.0% = 1,140 mL
Volume of Water (Vwater ) = 19,000 mL – 1,140 mL = 17,860 mL
Mass of Alcohol (Malc ) = 1,140 mL * 0.789 g/mL = 900.06 g
Mass of Water (Mwater ) = 17,860 mL * 0.998 g/mL = 17,824.28 g
Total Mass (Mtotal ) = 900.06 g + 17,824.28 g = 18,724.34 g
ABW (%) = (900.06 g / 18,724.34 g) * 100 ≈ 4.81%
Result: The craft beer is approximately 4.81% Alcohol By Weight . This is lower than its 6.0% ABV, as expected.
This ABW figure is important for certain labeling requirements or internal quality checks in the brewery.
Example 2: Distilling a Spirit
A distiller has produced a spirit that measures 75.0% ABV. They need to report the ABW for tax purposes.
Inputs:
Liquid Volume: 1,000 mL
Alcohol Concentration (V/V): 75.0%
Temperature: 15.56°C (standard reference temp for density)
Standard densities at 15.56°C: Alcohol Density (ρalc ) ≈ 0.789 g/mL, Water Density (ρwater ) ≈ 0.999 g/mL.
Calculation Steps:
Volume of Alcohol (Valc ) = 1,000 mL * 75.0% = 750 mL
Volume of Water (Vwater ) = 1,000 mL – 750 mL = 250 mL
Mass of Alcohol (Malc ) = 750 mL * 0.789 g/mL = 591.75 g
Mass of Water (Mwater ) = 250 mL * 0.999 g/mL = 249.75 g
Total Mass (Mtotal ) = 591.75 g + 249.75 g = 841.50 g
ABW (%) = (591.75 g / 841.50 g) * 100 ≈ 70.32%
Result: The spirit is approximately 70.32% Alcohol By Weight . This is substantially lower than its 75.0% ABV.
This precise ABW measurement is critical for official documentation and excise tax calculations in the spirits industry. Accurate density adjustments based on temperature are vital here.
How to Use This Alcohol By Weight Calculator
Our Alcohol By Weight (ABW) Calculator is designed for ease of use, providing accurate calculations with minimal input. Follow these simple steps:
Input Liquid Volume: Enter the total volume of your beverage in milliliters (mL). This is the starting point for all calculations.Enter Alcohol Concentration (ABV): Provide the Alcohol By Volume percentage for your beverage. This is the most common way alcohol content is measured commercially.Provide Densities: Input the density of pure ethanol (alcohol) and the density of water. These values can vary slightly with temperature. Standard values are pre-filled but can be adjusted for greater precision.Specify Temperature: Enter the temperature of the liquid in Celsius (°C). This helps in potentially adjusting densities, although our calculator uses standard densities for common temperatures unless explicitly overridden.Click "Calculate ABW": Once all fields are populated, click the button. The calculator will instantly display your results.
Reading the Results:
Primary Result (ABW %): This is the main output, showing the alcohol content as a percentage of the total weight.Intermediate Values: You'll see the calculated Total Liquid Mass, Total Alcohol Mass, Total Water Mass, and the Calculated Liquid Density. These provide a detailed breakdown.Mass Breakdown Table: This table clearly shows the mass of alcohol and water as a percentage of the total weight.Mass Distribution Chart: A visual representation of how the mass is distributed between alcohol and water across different potential alcohol concentrations.
Decision-Making Guidance:
The ABW result is crucial for:
Regulatory Compliance: Ensuring your product meets legal requirements for labeling and taxation, especially in industries like brewing and distilling.Quality Control: Verifying the precise composition of your product for consistency and adherence to formulation standards.Process Optimization: Understanding the mass-based composition can aid in fine-tuning fermentation or distillation processes.
Use the Copy Results button to easily transfer the data for reports or further analysis. The Reset button clears all fields and restores default, sensible values.
Key Factors That Affect Alcohol By Weight Results
Several factors can influence the accuracy and interpretation of Alcohol By Weight (ABW) calculations. Understanding these is key to precise measurement:
Temperature: This is arguably the most significant factor affecting density. Both water and ethanol expand when heated and contract when cooled. As densities change, the calculated masses and thus the ABW percentage will also shift. Using densities specific to the beverage's actual temperature is crucial for high accuracy. Our calculator prompts for temperature to facilitate this.
Accuracy of Input Volumes: Precise measurement of the total liquid volume and the alcohol volume (derived from ABV) is fundamental. Small errors in volume measurement can lead to noticeable deviations in the final ABW.
Purity of Alcohol (Ethanol): The calculation assumes pure ethanol. In real-world beverages, especially fermented ones, trace amounts of other compounds (like methanol, fusel alcohols) exist. While typically minor, their densities might differ slightly, introducing a small margin of error.
Presence of Other Dissolved Solids: Sugars, proteins, acids, and other compounds in beverages like beer, wine, or liqueurs contribute to the overall density and mass. High concentrations of dissolved solids will increase the liquid's density and lower the ABW compared to a simple water-ethanol mixture at the same ABV. Our calculator, by default, uses the density of a water-ethanol mixture, but a specific 'Liquid Density' input allows for these complexities to be accounted for if known.
Calibration of Measurement Instruments: The accuracy of hydrometers, pycnometers, or density meters used to determine densities directly impacts the ABW calculation. Regular calibration is essential.
Water vs. Alcohol Density Values: Ensuring you use the correct density values for water and alcohol at the specified temperature is critical. Different sources might provide slightly varied figures, especially for alcohol density, which is more sensitive to impurities and temperature.
CO2 Content: Carbonation can slightly affect density measurements. For highly carbonated beverages, degassing might be necessary before accurate density determination.
By carefully considering these factors and using accurate input data, you can achieve reliable ABW measurements for your specific application. Consulting resources like the [Internal Link: Beverage Alcohol Measurement Standards] can provide further insights.
Frequently Asked Questions (FAQ)
Q1: Is Alcohol By Weight (ABW) the same as Alcohol By Volume (ABV)?
No, ABW and ABV are different. ABV measures the volume of pure alcohol as a percentage of the total liquid volume, while ABW measures the weight of pure alcohol as a percentage of the total liquid weight. Because ethanol is less dense than water, the ABW percentage will always be lower than the ABV percentage for the same beverage.
Q2: Why is ABW lower than ABV?
Ethanol has a density of approximately 0.789 g/mL, while water has a density of approximately 1.000 g/mL. When you have a mixture, the alcohol contributes less to the total weight than it does to the total volume. Therefore, the percentage by weight is lower.
Q3: When is ABW used instead of ABV?
ABW is often used in specific industrial contexts, such as certain aspects of brewing, distilling, chemical analysis, and regulatory reporting where mass-based calculations are preferred or required. ABV is the standard for most consumer-facing alcohol content labeling.
Q4: How does temperature affect ABW calculation?
Temperature significantly affects the density of both alcohol and water. As temperature increases, densities decrease, and vice versa. Since ABW is a weight-based calculation, changes in density directly impact the result. For precise measurements, densities corresponding to the actual beverage temperature should be used.
Q5: Can I use this calculator for fermented beverages like beer and wine?
Yes, you can. However, for accuracy, you need to input the correct Alcohol By Volume (ABV) and consider the density of the final liquid, which might be affected by dissolved sugars, proteins, and other solids. If you know the final density of your beer or wine, use that in the 'Liquid Density' field for a more accurate ABW. Otherwise, the calculator estimates based on a water-ethanol mix.
Q6: What is the typical range for ABW in common beverages?
For spirits that are 40% ABV (80 proof), the ABW is typically around 31-33%. For beers around 5% ABV, the ABW might be around 4%. Wine around 12% ABV could be around 9.5-10% ABW. These are approximate figures as dissolved solids and temperature play a role.
Q7: Does the calculator account for other ingredients besides alcohol and water?
The default calculation primarily models a water-ethanol mixture. However, the "Liquid Density" input field allows you to manually input the measured density of your specific beverage if it contains significant amounts of other dissolved solids (like sugars in beer or wine). If you leave "Liquid Density" at its default, the calculator will derive density based on the water-ethanol proportion.
Q8: How accurate is the ABW calculation without precise density measurements?
Our calculator provides a good estimate using standard water and ethanol densities based on the provided ABV and temperature. However, for highly accurate, regulatory-grade measurements, especially with beverages containing significant dissolved solids (sugars, flavors), measuring the actual liquid density using a calibrated densitometer or hydrometer at the specific temperature is recommended.
Related Tools and Internal Resources
var currentChart = null; // Global variable to hold the chart instance
function getDensity(alcoholPercentage, temperature) {
// Simplified approximation for ethanol density based on temperature
// More accurate values would require lookup tables.
// Source: Engineering Toolbox (approximate values)
var baseAlcoholDensity = 0.789; // at 15.56 C
var tempDiff = temperature – 15.56;
var densityCorrection = tempDiff * 0.0021; // Approximate change per degree C
var alcoholDensity = baseAlcoholDensity – densityCorrection;
// Simplified approximation for water density based on temperature
// Source: Engineering Toolbox (approximate values)
var baseWaterDensity = 1.000; // at 4 C
if (temperature > 4) {
baseWaterDensity = 0.99997; // at 15 C
}
if (temperature > 15.56) {
baseWaterDensity = 0.99894; // at 15.56 C
}
var waterDensityCorrection = (temperature – 15.56) * 0.00003; // Very rough approx
var waterDensity = baseWaterDensity – waterDensityCorrection;
// Adjust densities for the given temperature for better accuracy
if (temperature >= 0 && temperature <= 100) {
// Using simplified polynomial approximations
// Alcohol density correction (approximate)
alcoholDensity = 0.7893 – (0.00130 * temperature) – (0.0000012 * Math.pow(temperature, 2));
// Water density correction (approximate)
waterDensity = 0.99984 – (0.0000075 * temperature) – (0.00000012 * Math.pow(temperature, 2));
// Ensure densities remain within a reasonable range
if (alcoholDensity 0.8) alcoholDensity = 0.789; // Fallback
if (waterDensity 1.01) waterDensity = 1.000; // Fallback
} else {
// Default to values at 15.56 C if temperature is out of common range
alcoholDensity = 0.789;
waterDensity = 0.999;
}
return { alcohol: alcoholDensity, water: waterDensity };
}
function validateInput(id, minValue, maxValue, allowEmpty = false) {
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}
return true;
}
function calculateABW() {
var liquidVolume = parseFloat(document.getElementById("liquidVolume").value);
var liquidDensityInput = parseFloat(document.getElementById("liquidDensity").value); // User provided density
var alcoholConcentrationV = parseFloat(document.getElementById("alcoholConcentrationV").value);
var temperature = parseFloat(document.getElementById("temperature").value);
// Validation
var isValid = true;
isValid = validateInput("liquidVolume", 0) && isValid;
isValid = validateInput("liquidDensity", 0) && isValid; // Allow user override, so basic validation only
isValid = validateInput("alcoholConcentrationV", 0, 100) && isValid;
isValid = validateInput("alcoholDensity", 0) && isValid;
isValid = validateInput("waterDensity", 0) && isValid;
isValid = validateInput("temperature", -50, 150) && isValid; // Reasonable temperature range
if (!isValid) {
document.getElementById("resultsSection").style.display = "none";
return;
}
var alcoholDensity = parseFloat(document.getElementById("alcoholDensity").value);
var waterDensity = parseFloat(document.getElementById("waterDensity").value);
// If user hasn't specified liquid density, we derive it
var calculatedLiquidDensity;
var useProvidedLiquidDensity = !isNaN(liquidDensityInput) && liquidDensityInput > 0;
var volumeAlcohol = liquidVolume * (alcoholConcentrationV / 100);
var volumeWater = liquidVolume – volumeAlcohol;
var massAlcohol = volumeAlcohol * alcoholDensity;
var massWater = volumeWater * waterDensity;
var totalMass = massAlcohol + massWater;
// Use user-provided liquid density if valid, otherwise calculate it
if (useProvidedLiquidDensity) {
calculatedLiquidDensity = liquidDensityInput;
// Adjust massWater and massAlcohol to match the provided total mass
// This is a simplification; ideally, one would re-calculate based on this density.
// For now, we prioritize the user's density for total mass calculation.
totalMass = liquidVolume * calculatedLiquidDensity;
// Re-distribute mass proportionately IF user density is provided and calculation differs significantly
// A more robust approach would be needed if precision is paramount here.
// For simplicity, we use the user's density to set the total mass.
// Recalculate ABW based on this adjusted total mass.
if (totalMass === 0) { // Avoid division by zero
document.getElementById("resultsSection").style.display = "none";
return;
}
var adjustedMassAlcohol = massAlcohol * (totalMass / (massAlcohol + massWater)); // Proportional adjustment
var adjustedMassWater = massWater * (totalMass / (massAlcohol + massWater)); // Proportional adjustment
// Check if the provided density significantly differs from calculated water-ethanol density
var calculatedWaterEthanolDensity = (massAlcohol + massWater) / liquidVolume;
if (Math.abs(calculatedWaterEthanolDensity – calculatedLiquidDensity) > 0.05) { // Threshold for adjustment
massAlcohol = adjustedMassAlcohol;
massWater = adjustedMassWater;
totalMass = massAlcohol + massWater; // Recalculate total mass after adjustment
} else {
// If densities are close, use calculated masses directly
massAlcohol = massAlcohol;
massWater = massWater;
totalMass = massAlcohol + massWater;
}
} else {
calculatedLiquidDensity = totalMass / liquidVolume;
}
if (totalMass === 0) {
document.getElementById("resultsSection").style.display = "none";
return;
}
var abw = (massAlcohol / totalMass) * 100;
// Display Results
document.getElementById("primaryResult").textContent = abw.toFixed(2) + " % ABW";
document.querySelector(".results-container .result-item:nth-of-type(1) span").textContent = totalMass.toFixed(2) + " g";
document.querySelector(".results-container .result-item:nth-of-type(2) span").textContent = massAlcohol.toFixed(2) + " g";
document.querySelector(".results-container .result-item:nth-of-type(3) span").textContent = massWater.toFixed(2) + " g";
document.querySelector(".results-container .result-item:nth-of-type(4) span").textContent = calculatedLiquidDensity.toFixed(3) + " g/mL";
// Update Table
document.getElementById("resultsTableBody").innerHTML =
"
Alcohol " + massAlcohol.toFixed(2) + " g " + (massAlcohol / totalMass * 100).toFixed(2) + " % " +
"
Water " + massWater.toFixed(2) + " g " + (massWater / totalMass * 100).toFixed(2) + " % " +
"
Total " + totalMass.toFixed(2) + " g 100.00 % ";
document.getElementById("resultsSection").style.display = "block";
updateChart(abw, alcoholConcentrationV, massAlcohol, massWater, totalMass);
}
function updateChart(currentABW, currentABV, massAlcohol, massWater, totalMass) {
var ctx = document.getElementById('abwChart').getContext('2d');
// Define data points for the chart (e.g., ABV vs ABW, and component masses)
var chartData = {
labels: ['Low ABV (e.g., 4%)', 'Medium ABV (e.g., 15%)', 'High ABV (e.g., 40%)', 'Spirits (e.g., 75%)', 'Current (' + currentABV.toFixed(1) + '% ABV)'],
datasets: [
{
label: 'Alcohol By Weight (%)',
backgroundColor: 'rgba(0, 74, 153, 0.5)', // Primary color with transparency
borderColor: 'var(–primary-color)',
borderWidth: 1,
data: [
4.0 * 0.78, // Approximate ABW for 4% ABV
15.0 * 0.83, // Approximate ABW for 15% ABV
40.0 * 0.88, // Approximate ABW for 40% ABV
75.0 * 0.93, // Approximate ABW for 75% ABV
currentABW // Current calculated ABW
],
fill: false,
type: 'line', // Line chart for ABW trend
yAxisID: 'y-axis-percentage'
},
{
label: 'Alcohol Mass (g)',
backgroundColor: 'rgba(40, 167, 69, 0.6)', // Success color with transparency
borderColor: 'var(–success-color)',
borderWidth: 1,
data: [
(0.04 * 1000 * 0.789), // Mass alcohol for 4% ABV beer (assuming 1000ml total)
(0.15 * 1000 * 0.789), // Mass alcohol for 15% ABV wine (assuming 1000ml total)
(0.40 * 1000 * 0.789), // Mass alcohol for 40% ABV spirit (assuming 1000ml total)
(0.75 * 1000 * 0.789), // Mass alcohol for 75% ABV spirit (assuming 1000ml total)
massAlcohol // Current calculated alcohol mass
],
fill: false,
type: 'bar', // Bar chart for mass comparison
yAxisID: 'y-axis-mass'
},
{
label: 'Water Mass (g)',
backgroundColor: 'rgba(108, 117, 125, 0.6)', // Muted color
borderColor: '#6c757d',
borderWidth: 1,
data: [
(0.96 * 1000 * 0.999), // Mass water for 4% ABV beer (assuming 1000ml total)
(0.85 * 1000 * 0.999), // Mass water for 15% ABV wine (assuming 1000ml total)
(0.60 * 1000 * 0.999), // Mass water for 40% ABV spirit (assuming 1000ml total)
(0.25 * 1000 * 0.999), // Mass water for 75% ABV spirit (assuming 1000ml total)
massWater // Current calculated water mass
],
fill: false,
type: 'bar', // Bar chart for mass comparison
yAxisID: 'y-axis-mass'
}
]
};
var options = {
responsive: true,
maintainAspectRatio: false,
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Alcohol By Volume (ABV) Level'
}
}],
'y-axis-percentage': {
type: 'linear',
position: 'left',
scaleLabel: {
display: true,
labelString: 'Alcohol By Weight (%)'
},
ticks: {
beginAtZero: true,
max: 100 // ABW max is 100%
}
},
'y-axis-mass': {
type: 'linear',
position: 'right',
scaleLabel: {
display: true,
labelString: 'Mass (grams)'
},
ticks: {
beginAtZero: true
},
gridLines: {
drawOnChartArea: false, // only want the grid lines for one axis to show up
}
}
},
legend: {
display: true,
position: 'top'
}
};
// Destroy previous chart instance if it exists
if (currentChart) {
currentChart.destroy();
}
// Create the new chart
currentChart = new Chart(ctx, {
type: 'bar', // Default type, but datasets specify their own
data: chartData,
options: options
});
}
function resetCalculator() {
document.getElementById("liquidVolume").value = "1000";
document.getElementById("liquidDensity").value = "0.983"; // Default for ~40% ABV
document.getElementById("alcoholConcentrationV").value = "40";
document.getElementById("alcoholDensity").value = "0.789";
document.getElementById("waterDensity").value = "0.999";
document.getElementById("temperature").value = "15.56";
// Clear errors
document.getElementById("liquidVolumeError").innerText = "";
document.getElementById("liquidDensityError").innerText = "";
document.getElementById("alcoholConcentrationLError").innerText = "";
document.getElementById("alcoholDensityError").innerText = "";
document.getElementById("waterDensityError").innerText = "";
document.getElementById("temperatureError").innerText = "";
document.getElementById("liquidVolume").style.borderColor = '#ccc';
document.getElementById("liquidDensity").style.borderColor = '#ccc';
document.getElementById("alcoholConcentrationV").style.borderColor = '#ccc';
document.getElementById("alcoholDensity").style.borderColor = '#ccc';
document.getElementById("waterDensity").style.borderColor = '#ccc';
document.getElementById("temperature").style.borderColor = '#ccc';
document.getElementById("resultsSection").style.display = "none";
if (currentChart) {
currentChart.destroy();
currentChart = null;
}
}
function copyResults() {
var primaryResult = document.getElementById("primaryResult").textContent;
var resultItems = document.querySelectorAll(".results-container .result-item");
var tableRows = document.querySelectorAll("#resultsTableBody tr");
var formulaText = document.querySelector(".formula-explanation").textContent.replace("Formula Explanation:", "Formula:\n");
var contentToCopy = "— Alcohol By Weight (ABW) Calculation Results —\n\n";
contentToCopy += "Primary Result: " + primaryResult + "\n\n";
resultItems.forEach(function(item) {
var label = item.childNodes[0].textContent.trim();
var value = item.querySelector("span").textContent.trim();
contentToCopy += label + ": " + value + "\n";
});
contentToCopy += "\n" + formulaText + "\n\n";
contentToCopy += "— Mass Breakdown Table —\n";
tableRows.forEach(function(row) {
var cells = row.querySelectorAll("td");
contentToCopy += cells[0].textContent + "\t" + cells[1].textContent + "\t" + cells[2].textContent + "\n";
});
contentToCopy += "\n— Key Assumptions —\n";
contentToCopy += "Temperature: " + document.getElementById("temperature").value + " °C\n";
contentToCopy += "Alcohol Density: " + document.getElementById("alcoholDensity").value + " g/mL\n";
contentToCopy += "Water Density: " + document.getElementById("waterDensity").value + " g/mL\n";
if (document.getElementById("liquidDensity").value.trim() !== "" && parseFloat(document.getElementById("liquidDensity").value) > 0) {
contentToCopy += "User Provided Liquid Density: " + document.getElementById("liquidDensity").value + " g/mL\n";
}
// Use a temporary textarea to copy to clipboard
var tempTextArea = document.createElement("textarea");
tempTextArea.value = contentToCopy;
tempTextArea.style.position = "absolute";
tempTextArea.style.left = "-9999px"; // Move off-screen
document.body.appendChild(tempTextArea);
tempTextArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Results copied to clipboard!' : 'Copying failed!';
// Optionally display a success message
console.log(msg);
} catch (err) {
console.log('Oops, unable to copy');
}
document.body.removeChild(tempTextArea);
}
function toggleFAQ(element) {
var answer = element.nextElementSibling;
if (answer.style.display === "block") {
answer.style.display = "none";
} else {
answer.style.display = "block";
}
}
// Initial calculation on load if values are present, or after reset
document.addEventListener('DOMContentLoaded', function() {
calculateABW(); // Perform initial calculation
});
// Add event listeners for real-time updates
document.getElementById("liquidVolume").addEventListener("input", calculateABW);
document.getElementById("liquidDensity").addEventListener("input", calculateABW);
document.getElementById("alcoholConcentrationV").addEventListener("input", calculateABW);
document.getElementById("temperature").addEventListener("input", calculateABW);
document.getElementById("alcoholDensity").addEventListener("input", calculateABW);
document.getElementById("waterDensity").addEventListener("input", calculateABW);
// Inject Chart.js library dynamically (if not available in a real environment)
// In a production scenario, you'd include this in
var script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.7.0/dist/chart.min.js'; // Using a specific version
script.onload = function() {
// Chart.js is loaded, now we can call updateChart if needed
// Initial calculation ensures chart is drawn on load if calculateABW is called.
// If calculateABW is not called initially, you might need to call it here after chart.js loads.
if (document.getElementById("resultsSection").style.display === "block") {
// If results were already shown (e.g., defaults), update the chart
calculateABW();
}
};
document.head.appendChild(script);