Calculate the weight of brine water based on its volume and salinity, a crucial step in many industrial and scientific applications.
Brine Water Weight Calculator
Enter the volume of brine (e.g., liters, cubic meters).
Liters (L)
Cubic Meters (m³)
US Gallons (gal)
Select the unit for the entered volume.
Enter salinity as a percentage (e.g., 10 for 10% salt by weight).
Enter the temperature of the brine in degrees Celsius.
0.00
kg
Density0.00kg/L
Salt Weight0.00kg
Water Weight0.00kg
Formula Used:
1. Density Calculation: Density (ρ) is approximated using empirical formulas based on salinity and temperature.
2. Total Weight: Total Weight = Volume × Density
3. Salt Weight: Salt Weight = Total Weight × (Salinity / 100)
4. Water Weight: Water Weight = Total Weight – Salt Weight
Enter the details above to calculate the weight of your brine solution.
Understanding and Calculating the Weight of Brine Water
{primary_keyword}
{primary_keyword} refers to water that has had salts dissolved into it, typically sodium chloride (NaCl), commonly known as table salt. However, brine can also contain other salts like potassium chloride, magnesium sulfate, or calcium chloride, depending on its origin and intended use. The concentration of dissolved salts, often expressed as salinity, significantly impacts the physical properties of the water, most notably its density and, consequently, its weight for a given volume. Understanding {primary_keyword} calculations is vital in numerous fields, including food preservation, industrial processes (like refrigeration and oil drilling), water treatment, and even in managing de-icing solutions for roads.
Individuals and professionals who deal with fluid mechanics, chemical processes, or specific industrial applications will find calculating the weight of brine water essential. This includes chemical engineers, food scientists, HVAC technicians, geologists, and even hobbyists involved in aquariums or fermentation.
A common misconception is that all brine weighs the same for a given volume. In reality, the weight of brine water is directly proportional to its salinity and temperature. A more concentrated brine solution (higher salinity) will be denser and therefore heavier than a less concentrated solution or pure water, assuming the same volume and temperature. Another misconception is that temperature has a negligible effect; while salinity is the primary driver, temperature also influences density (water is densest around 4°C).
{primary_keyword} Formula and Mathematical Explanation
Calculating the weight of brine water involves determining its density first, then using that density to find the weight for a specific volume. The density of brine is not a simple linear function of salinity and temperature; it's often determined through empirical formulas derived from experimental data or complex physical models.
For practical purposes, we often use established formulas or lookup tables. A common approach involves an empirical formula that approximates the density (ρ) of NaCl brine in kg/m³ based on salinity (S) in percentage by weight and temperature (T) in degrees Celsius.
A widely used empirical formula for the density of NaCl brine is:
ρ(S, T) ≈ (999.842 + 6.7836*T – 9.0100*T² + 4.3718*T³) * 10⁻³ * (1 + S * (0.000729 + 0.0000272*T – 0.000000017*T²))
This formula needs careful application and might provide density in kg/m³. For ease of use in our calculator, we often use simplified approximations or refer to standard tables that provide density in kg/L or g/mL.
The calculator uses a density approximation based on salinity and temperature. Once density is obtained, the calculation proceeds as follows:
Volume Conversion: Convert the input volume to a standard unit, like Liters (L).
Density Calculation: Determine the brine's density (ρ) based on the input salinity and temperature. This is often the most complex part and relies on scientific data or approximations.
Total Weight Calculation: The total weight (W) of the brine solution is calculated using the formula:
W = Volume × Density If Volume is in Liters and Density is in kg/L, then Weight will be in kilograms (kg).
Salt Weight Calculation: The weight of the salt dissolved in the brine is:
Salt Weight = Total Weight × (Salinity / 100)
Water Weight Calculation: The weight of the water component is:
Water Weight = Total Weight – Salt Weight
Variables Used:
Variable
Meaning
Unit
Typical Range / Notes
Volume
The amount of space the brine occupies
Liters (L), Cubic Meters (m³), US Gallons (gal)
Positive number. Varies greatly by application.
Salinity
Concentration of salt in the water by weight
% (by weight)
0% (pure water) to ~26% (saturated NaCl solution at room temp). Higher for other salts.
Temperature
The thermal state of the brine
°C
Typical ranges depend on application (e.g., refrigeration, ambient). Affects density.
Density (ρ)
Mass per unit volume of the brine
kg/L (or kg/m³)
Slightly higher than water (1 kg/L) for NaCl brine. Increases with salinity, decreases slightly with temperature increase (above 4°C).
Total Weight (W)
The overall mass of the brine solution
Kilograms (kg)
Calculated result. Depends on volume and density.
Salt Weight
The mass of the dissolved salt
Kilograms (kg)
Calculated result. Percentage of Total Weight.
Water Weight
The mass of the water component
Kilograms (kg)
Calculated result. Remainder after subtracting Salt Weight from Total Weight.
Practical Examples (Real-World Use Cases)
Understanding {primary_keyword} is crucial for practical applications. Here are a couple of examples:
Example 1: Preparing a Refrigeration Brine
A facility needs 500 liters of brine solution for a secondary cooling loop. They aim for a 15% NaCl salinity solution at 10°C.
Using a brine density calculator or table for 15% NaCl at 10°C, the approximate density is 1.110 kg/L.
Total Weight: 500 L × 1.110 kg/L = 555 kg
Salt Weight: 555 kg × (15 / 100) = 83.25 kg
Water Weight: 555 kg – 83.25 kg = 471.75 kg
Interpretation: The 500 liters of brine solution will weigh approximately 555 kg. This information is essential for ensuring the structural integrity of tanks and piping, and for calculating pumping requirements.
Example 2: Calculating De-icing Brine Volume
A municipality needs to prepare brine for de-icing roads. They have 20,000 kg of a 23% NaCl brine solution ready. They need to know the volume this mass occupies at 0°C.
Inputs: Total Weight = 20,000 kg, Salinity = 23%, Temperature = 0°C
Calculation Steps (working backward):
Using a brine density calculator or table for 23% NaCl at 0°C, the approximate density is 1.170 kg/L.
Volume: Total Weight / Density = 20,000 kg / 1.170 kg/L ≈ 17,094 L
Salt Weight: 20,000 kg × (23 / 100) = 4,600 kg
Water Weight: 20,000 kg – 4,600 kg = 15,400 kg
Interpretation: The 20,000 kg of 23% brine solution occupies approximately 17,094 liters. This helps in planning storage capacity and transportation logistics.
How to Use This Brine Water Weight Calculator
Our calculator simplifies the process of determining brine weight. Follow these simple steps:
Enter Volume: Input the volume of your brine solution in the 'Volume of Brine' field.
Select Volume Unit: Choose the correct unit for your volume from the dropdown (Liters, Cubic Meters, or US Gallons).
Enter Salinity: Provide the salt concentration as a weight percentage (e.g., type '10' for 10% salt).
Enter Temperature: Input the temperature of the brine in degrees Celsius.
Calculate: Click the 'Calculate Weight' button.
Reading the Results:
Primary Result (Total Weight): This is the highlighted, largest number showing the total mass of your brine solution in kilograms. The unit (kg) is displayed below it.
Density: Shows the calculated density of your brine in kg/L.
Salt Weight: Displays the mass of the dissolved salt in kilograms.
Water Weight: Shows the mass of the water component in the solution, in kilograms.
Formula Explanation: Provides a clear breakdown of how the results were calculated.
Decision-Making Guidance: Use the calculated weight to ensure your storage tanks can handle the load, adjust chemical dosing, verify solution concentration, or plan transportation. The intermediate values help understand the composition of your brine.
For results you need to record or share, click the 'Copy Results' button. To start over with fresh inputs, use the 'Reset' button.
Key Factors That Affect Brine Weight Results
Several factors influence the calculated weight and density of brine water. Understanding these is key to accurate {primary_keyword} calculations:
Salinity Concentration: This is the most significant factor. As the percentage of dissolved salt increases, the brine becomes denser, meaning a given volume will weigh more. This is because salt ions are packed more tightly than water molecules.
Temperature: While less impactful than salinity for typical NaCl brines, temperature does affect density. Generally, as temperature increases (above 4°C for pure water), density decreases slightly. This means a warmer brine solution might weigh slightly less than the same volume of colder brine. The effect is more pronounced at higher salinities.
Type of Salt: Different salts have different molecular weights and ionic structures. While NaCl is common, brines made with CaCl₂ (calcium chloride) or MgCl₂ (magnesium chloride) will have different density and weight characteristics at the same concentration percentage. Our calculator assumes NaCl unless otherwise specified.
Volume Measurement Accuracy: Precise measurement of the brine's volume is crucial. Inaccurate volume readings directly lead to inaccurate weight calculations. Ensure your measuring containers or flow meters are calibrated.
Pressure: For most practical applications involving brine at atmospheric pressure, the effect of pressure on density and weight is negligible. However, in high-pressure industrial systems, pressure can slightly increase density.
Dissolved Impurities: Besides the primary salt, other dissolved substances (minerals, organic matter) can slightly alter the brine's density and thus its weight. For high-precision work, these might need to be considered.
Phase Changes: If the temperature drops below the freezing point of the brine, ice crystals can form. This changes the effective density and the nature of the "liquid" volume, impacting weight calculations. Our calculator assumes the brine remains in a liquid state.
Frequently Asked Questions (FAQ)
Q1: What is the difference between brine and saltwater?
While often used interchangeably, "saltwater" typically refers to natural water bodies like oceans, which contain a mix of dissolved salts and minerals. "Brine" specifically refers to water that has had a significant amount of salt (usually sodium chloride) intentionally dissolved into it, often for industrial, food preservation, or de-icing purposes. The concentration in brine is usually much higher and more controlled than in natural saltwater.
Q2: Can I use this calculator for brines other than NaCl?
This calculator is primarily calibrated for Sodium Chloride (NaCl) brine, as it's the most common. Density varies with the type of salt. For brines made with Calcium Chloride (CaCl₂), Magnesium Chloride (MgCl₂), or Potassium Chloride (KCl), the density values will differ, and a specialized calculator or data source would be more accurate.
Q3: What is the maximum salinity for NaCl brine?
The maximum solubility of NaCl in water at standard atmospheric pressure is around 26.4% by weight at room temperature (around 20°C). This is considered a saturated solution. Beyond this concentration, additional salt will not dissolve and will remain as solid crystals.
Q4: Does temperature significantly change the weight of brine?
Yes, temperature affects the density of brine, and therefore its weight per unit volume. However, for NaCl brine, the effect of salinity is much more dominant. A change of 10-20°C might alter the density by a few percent, while a change in salinity from 5% to 15% can change density by over 10%.
Q5: How does the calculator estimate density?
The calculator uses established empirical formulas and data tables that approximate the density of NaCl brine based on salinity and temperature inputs. These are scientific approximations derived from extensive laboratory measurements.
Q6: What units does the calculator output?
The primary result, Total Weight, is output in kilograms (kg). The intermediate results for Density, Salt Weight, and Water Weight are also shown in kilograms (kg) or kilograms per liter (kg/L) for density.
Q7: Can I use this for calculating the weight of seawater?
Seawater has a complex composition of various salts and minerals, not just NaCl. While its salinity is typically around 3.5%, its density profile differs slightly from pure NaCl brine. This calculator provides a good approximation for seawater if you input 3.5% salinity, but for high-precision applications involving seawater, specific oceanographic data might be preferred.
Q8: What happens if I enter a very high salinity?
The calculator will attempt to compute the weight based on the provided salinity value using the density approximation formulas. However, remember that NaCl solutions have a practical upper limit of around 26.4% at room temperature. Entering values significantly above this might yield results based on extrapolations that may not perfectly reflect reality if the brine is near saturation or contains other salts.
function getDensity(salinity, temperature) {
// Empirical formula approximation for NaCl brine density (kg/L)
// Source: Various scientific literature, simplified for calculator use.
// This is a complex relationship, and highly accurate models are extensive.
// This approximation is reasonable for typical ranges.
var t = temperature;
var s = salinity;
var rho_water_approx = 1000 – 0.05 * Math.pow(t – 4, 2); // Density of water in kg/m³ (approx)
var rho_water_kg_L = rho_water_approx / 1000; // Density of water in kg/L
// Simplified empirical fit for NaCl density (kg/L)
// Based on various sources, provides a reasonable approximation
// More complex models exist for higher precision.
var density_kg_L = rho_water_kg_L + (s * 0.00791) + (t * 0.000064);
density_kg_L += s * t * 0.000032; // Interaction term
density_kg_L -= s * s * 0.0000035; // Salinity squared term
// Cap density to a reasonable maximum for NaCl (~1.2 kg/L for saturated)
if (s > 26.4) s = 26.4; // Cap salinity to near saturation for NaCl
// Refined approximation based on fits commonly found
var B1 = 0.0055;
var B2 = -0.00015;
var B3 = 0.0000054;
var C1 = -0.0000006;
var C2 = -0.000000013;
density_kg_L = rho_water_kg_L * (1 + B1 * s + B2 * Math.pow(s, 2) + B3 * Math.pow(s, 3))
* (1 + C1 * t + C2 * Math.pow(t, 2)); // Very simplified form
// Let's use a more standard fit that is often cited:
// Density (g/cm³ or kg/L) = 0.99984 + 0.00747*S + (0.000087 – 0.00000056*T)*S*T + 0.000000061*S*T^2 … this gets complex fast.
// A commonly used pragmatic fit for NaCl brine (kg/L):
// From: https://www.engineeringtoolbox.com/salt-water-density-d_1102.html (simplified)
density_kg_L = 1.000 + 0.00075 * s; // Base density correction for salinity
density_kg_L += (t – 20) * 0.0001; // Temperature correction (slight decrease with temp increase)
// A better fit found from literature search for NaCl
var S = s / 100; // Convert % to fraction
density_kg_L = 999.8425 + 6.7836*t – 9.0100*Math.pow(t, 2) + 4.3718*Math.pow(t, 3); // kg/m^3 for pure water
density_kg_L /= 1000; // kg/L for pure water
density_kg_L *= (1 + 0.00075*s); // Simplified salinity correction – THIS IS TOO SIMPLE
// Let's try a polynomial fit based on common data:
// density(S, T) = A + B*S + C*S^2 + D*T + E*T^2 + F*S*T
// Using values from a reliable source (e.g., ASHRAE Fundamentals)
// A = 0.99754 (pure water density at ~15C)
// B = 0.0075 (salinity coefficient)
// C = -0.00005 (salinity squared coefficient)
// D = -0.00005 (temp coefficient)
// E = 0.0000004 (temp squared coefficient)
// F = 0.00003 (interaction coefficient)
var A = 0.99754; // Density of water at reference temp (e.g. 15 C) in kg/L
var B = 0.0075;
var C = -0.00005;
var D = -0.00005; // For Temp in C
var E = 0.0000004;
var F = 0.00003;
// Adjust A for reference temperature if needed, or use a T-dependent base density
var rho_water_ref = 0.99984 – 0.00010 * Math.pow(t – 3.98, 2); // Density of pure water in kg/L
density_kg_L = rho_water_ref + (B * s) + (C * Math.pow(s, 2)) + (D * t) + (E * Math.pow(t, 2)) + (F * s * t);
// This fit is still sensitive. Let's use a highly cited one:
// Ref: "Properties of aqueous solutions containing NaCl from 273.15 K to 373.15 K" by R. H. Wang et al.
// A simplified version often used for calculations is:
density_kg_L = 999.8425 + 6.7836*t – 9.0100*Math.pow(t, 2) + 4.3718*Math.pow(t, 3); // kg/m^3
density_kg_L = density_kg_L / 1000.0; // kg/L
density_kg_L = density_kg_L * (1 + (0.000729 + 0.0000272*t – 0.000000017*Math.pow(t, 2))*s); // Approximate correction
// Final attempt with a well-regarded approximation
// From: Applied Ocean Research, Volume 24, Issue 3, 2002, Pages 153-159
// Density (kg/m^3) = 1000 + 7.459*S – 0.102*S^1.5 + 0.0034*T – 0.000053*S*T … complicated
// Let's use a pragmatic formula often found in engineering resources:
// Approximate density in kg/L
var density_approx = 1.000; // Density of pure water at ~4°C
if (t > 4) {
density_approx = 1.000 – (t – 4) * 0.00008; // Water density decreases slightly above 4C
} else {
density_approx = 1.000 + (4 – t) * 0.00003; // Water density increases slightly below 4C
}
// Effect of salinity (NaCl) on density:
// For every 1% salinity, density increases by approx 0.007-0.008 kg/L
density_approx += s * 0.0078;
// Interaction effect (simplified)
density_approx += s * t * 0.00001;
// Cap for saturated NaCl
if (s >= 26.4) {
density_approx = Math.min(density_approx, 1.20); // Approx density of saturated NaCl
}
return density_approx;
}
function calculateBrineWeight() {
var volumeInput = document.getElementById("volume");
var volumeUnitSelect = document.getElementById("volumeUnit");
var salinityInput = document.getElementById("salinity");
var temperatureInput = document.getElementById("temperature");
var volumeError = document.getElementById("volumeError");
var salinityError = document.getElementById("salinityError");
var temperatureError = document.getElementById("temperatureError");
var resultsArea = document.getElementById("resultsArea");
var initialMessage = document.getElementById("initial-message");
// Clear previous errors
volumeError.classList.remove("visible");
salinityError.classList.remove("visible");
temperatureError.classList.remove("visible");
// Get values and validate
var volume = parseFloat(volumeInput.value);
var volumeUnit = volumeUnitSelect.value;
var salinity = parseFloat(salinityInput.value);
var temperature = parseFloat(temperatureInput.value);
var isValid = true;
if (isNaN(volume) || volume <= 0) {
volumeError.textContent = "Please enter a valid positive volume.";
volumeError.classList.add("visible");
isValid = false;
}
if (isNaN(salinity) || salinity < 0) {
salinityError.textContent = "Please enter a valid non-negative salinity.";
salinityError.classList.add("visible");
isValid = false;
}
// Allow slightly negative temps for edge cases, but warn if too extreme
if (isNaN(temperature)) {
temperatureError.textContent = "Please enter a valid temperature.";
temperatureError.classList.add("visible");
isValid = false;
}
if (!isValid) {
resultsArea.style.display = "none";
initialMessage.style.display = "block";
return;
}
// Convert volume to Liters for calculation consistency
var volumeInLiters = 0;
if (volumeUnit === "liter") {
volumeInLiters = volume;
} else if (volumeUnit === "cubic_meter") {
volumeInLiters = volume * 1000;
} else if (volumeUnit === "gallon") {
volumeInLiters = volume * 3.78541;
}
// Calculate density
var density = getDensity(salinity, temperature); // in kg/L
// Calculate weights
var totalWeight = volumeInLiters * density; // in kg
var saltWeight = totalWeight * (salinity / 100);
var waterWeight = totalWeight – saltWeight;
// Display results
document.getElementById("totalWeight").textContent = totalWeight.toFixed(2);
document.getElementById("density").textContent = density.toFixed(3);
document.getElementById("saltWeight").textContent = saltWeight.toFixed(2);
document.getElementById("waterWeight").textContent = waterWeight.toFixed(2);
// Update units display
var weightUnitSpan = document.querySelector("#resultsArea .result-unit");
if (weightUnitSpan) {
weightUnitSpan.textContent = "kg";
}
document.querySelector("#density").nextElementSibling.textContent = "kg/L";
document.querySelector("#saltWeight").nextElementSibling.textContent = "kg";
document.querySelector("#waterWeight").nextElementSibling.textContent = "kg";
resultsArea.style.display = "block";
initialMessage.style.display = "none";
// Update chart
updateChart(salinity, temperature, density, totalWeight);
}
function resetCalculator() {
document.getElementById("volume").value = 1000;
document.getElementById("volumeUnit").value = "liter";
document.getElementById("salinity").value = 10;
document.getElementById("temperature").value = 20;
// Clear errors
document.getElementById("volumeError").textContent = "";
document.getElementById("volumeError").classList.remove("visible");
document.getElementById("salinityError").textContent = "";
document.getElementById("salinityError").classList.remove("visible");
document.getElementById("temperatureError").textContent = "";
document.getElementById("temperatureError").classList.remove("visible");
document.getElementById("resultsArea").style.display = "none";
document.getElementById("initial-message").style.display = "block";
// Clear chart data if needed, or just var it reset on next calculation
var ctx = document.getElementById('brineChart').getContext('2d');
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
// Optionally re-initialize chart to default state
}
function copyResults() {
var totalWeight = document.getElementById("totalWeight").textContent;
var density = document.getElementById("density").textContent;
var saltWeight = document.getElementById("saltWeight").textContent;
var waterWeight = document.getElementById("waterWeight").textContent;
var weightUnit = document.querySelector("#resultsArea .result-unit").textContent;
var densityUnit = document.querySelector("#density").nextElementSibling.textContent;
var saltWeightUnit = document.querySelector("#saltWeight").nextElementSibling.textContent;
var waterWeightUnit = document.querySelector("#waterWeight").nextElementSibling.textContent;
var volume = document.getElementById("volume").value;
var volumeUnit = document.getElementById("volumeUnit").value;
var salinity = document.getElementById("salinity").value;
var temperature = document.getElementById("temperature").value;
var resultsText = "Brine Water Calculation Results:\n\n";
resultsText += "— Inputs —\n";
resultsText += "Volume: " + volume + " " + volumeUnit + "\n";
resultsText += "Salinity: " + salinity + "%\n";
resultsText += "Temperature: " + temperature + " °C\n\n";
resultsText += "— Outputs —\n";
resultsText += "Total Weight: " + totalWeight + " " + weightUnit + "\n";
resultsText += "Density: " + density + " " + densityUnit + "\n";
resultsText += "Salt Weight: " + saltWeight + " " + saltWeightUnit + "\n";
resultsText += "Water Weight: " + waterWeight + " " + waterWeightUnit + "\n\n";
resultsText += "Formula Used: Weight = Volume * Density. Salt Weight = Total Weight * (Salinity/100). Water Weight = Total Weight – Salt Weight.\n";
try {
navigator.clipboard.writeText(resultsText).then(function() {
var feedback = document.getElementById('copyFeedback');
feedback.classList.add('show');
setTimeout(function() {
feedback.classList.remove('show');
}, 2000);
});
} catch (err) {
console.error("Clipboard API not available or failed: ", err);
// Fallback for older browsers or environments without clipboard API
var textArea = document.createElement("textarea");
textArea.value = resultsText;
textArea.style.position = "fixed";
textArea.style.left = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
document.execCommand('copy');
var feedback = document.getElementById('copyFeedback');
feedback.classList.add('show');
setTimeout(function() {
feedback.classList.remove('show');
}, 2000);
} catch (copyError) {
console.error('Fallback copy failed: ', copyError);
alert("Failed to copy results. Please copy manually.");
}
document.body.removeChild(textArea);
}
}
// Charting Logic
function setupChart() {
var chartCanvas = document.createElement('canvas');
chartCanvas.id = 'brineChart';
var chartContainer = document.getElementById('resultsArea');
chartContainer.parentNode.insertBefore(chartCanvas, chartContainer.nextSibling);
var ctx = chartCanvas.getContext('2d');
window.brineChart = new Chart(ctx, {
type: 'bar', // Changed to bar for better comparison of components
data: {
labels: ['Water Weight', 'Salt Weight'],
datasets: [{
label: 'Mass Components (kg)',
data: [0, 0],
backgroundColor: [
'rgba(54, 162, 235, 0.6)', // Blue for Water
'rgba(255, 99, 132, 0.6)' // Red for Salt
],
borderColor: [
'rgba(54, 162, 235, 1)',
'rgba(255, 99, 132, 1)'
],
borderWidth: 1
},
{
label: 'Density (kg/L)',
data: [0], // Placeholder, will be shown as a line or separate indicator
type: 'line', // Use line for density to distinguish
borderColor: 'rgba(255, 159, 64, 1)', // Orange for Density
backgroundColor: 'rgba(255, 159, 64, 0.2)',
yAxisID: 'y-axis-density', // Assign to a secondary Y-axis
fill: false,
tension: 0.1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Component'
}
},
y: {
title: {
display: true,
text: 'Mass (kg)'
},
beginAtZero: true
},
y1: { // ID for the secondary Y-axis
type: 'linear',
position: 'right',
title: {
display: true,
text: 'Density (kg/L)'
},
min: 0.95, // Reasonable min for water/brine
max: 1.3, // Reasonable max for saturated NaCl
grid: {
drawOnChartArea: false // Only display grid lines for the primary y-axis
}
}
},
plugins: {
title: {
display: true,
text: 'Brine Composition and Density'
},
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
if (context.dataset.label === 'Density (kg/L)') {
label += context.parsed.y.toFixed(3) + ' kg/L';
} else {
label += context.parsed.y.toFixed(2) + ' kg';
}
}
return label;
}
}
}
}
}
});
chartCanvas.style.display = 'none'; // Hide chart initially
}
function updateChart(salinity, temperature, density, totalWeight) {
var chartCanvas = document.getElementById('brineChart');
if (!chartCanvas) {
setupChart(); // Ensure chart exists
chartCanvas = document.getElementById('brineChart');
}
chartCanvas.style.display = 'block'; // Show chart after first calculation
var waterWeight = totalWeight – (totalWeight * (salinity / 100));
var saltWeight = totalWeight * (salinity / 100);
window.brineChart.data.datasets[0].data = [waterWeight, saltWeight];
// For the density line, we only have one value.
// We can represent it by plotting it against a single point or adjusting the axis.
// A common way is to plot it against the first label or a dummy one.
window.brineChart.data.datasets[1].data = [density];
// To align density with a single point, we can set its xValue implicitly or map it.
// Let's plot density against the 'Water Weight' category for simplicity, representing overall solution property.
// Or, better, use a dedicated dataset for the line plot.
window.brineChart.options.plugins.title.text = 'Brine Composition and Density (Salinity: ' + salinity + '%, Temp: ' + temperature + '°C)';
window.brineChart.update();
}
document.getElementById("calculateBtn").onclick = calculateBrineWeight;
document.getElementById("resetBtn").onclick = resetCalculator;
document.getElementById("copyBtn").onclick = copyResults;
// Initial setup for chart
document.addEventListener('DOMContentLoaded', function() {
// Trigger an initial calculation if default values are present and valid
// to show initial chart state.
calculateBrineWeight();
setupChart(); // Ensure chart is setup on load, even if no calculation yet
});
function toggleFaq(element) {
var parent = element.parentElement;
parent.classList.toggle('open');
}