# Latent Heat

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Latent heat, abbreviated as L, is the energy absorbed or released by a substance during a constant temperature or phase change from a solid to liquid, liquid to gas or vise versa.

## Latent Heat Formulas

 $$\large{ L = \frac{Q}{m} }$$ $$\large{ L = 0.68 \; cfm \; \Delta gr }$$ (HVAC) btu/hr

### Where:

$$\large{ L }$$  = latent heat of a substance

$$\large{ cfm }$$  = cubic feet per minute

$$\large{ \Delta gr }$$  = grains/lb differential

$$\large{ m }$$ = mass of the substance

$$\large{ Q }$$ = amount of energy transferred for the phase change

### Solve for:

 $$\large{ Q = m \; L }$$