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Calculators/Physics/Latent Heat
Physics

Latent Heat calculator

Heat energy absorbed or released during a phase change from mass and the specific latent heat.

What this calculator does

Latent Heat works out heat energy absorbed or released during a phase change from mass and the specific latent heat. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.

The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.

The formula

FormulaQ = m × L

The inputs explained

FieldWhat to enter
Mass (kg)A number, measured in kg. Starts at 1.
Specific latent heat (L) (kJ/kg)A number, measured in kJ/kg. Starts at 334.

Worked examples

Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.

How the answer changes with mass

Every other input is held at the calculator’s starting values while mass varies. Select any row to load that scenario into the calculator.

How the answer changes with mass
Mass (kg)Heat energy (Q)In joulesIn kilowatt-hours
0.5167.000 kJ167,000 J0.046389 kWh
0.75250.500 kJ250,500 J0.069583 kWh
1334.000 kJ334,000 J0.092778 kWh
1.5501.000 kJ501,000 J0.139167 kWh
2668.000 kJ668,000 J0.185556 kWh
31,002.000 kJ1,002,000 J0.278333 kWh