# Specific Internal Energy

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Specific internal energy, abbreviated as u, is the internal energy per unit mass.

## Specific internal energy formula

$$\large{ u = \frac{U}{m} }$$
Symbol English Metric
$$\large{ u }$$ = specific internal energy $$\large{\frac{Btu}{lbm}}$$  $$\large{\frac{kJ}{kg}}$$
$$\large{ U }$$ = internal energy $$\large{Btu}$$ $$\large{ J }$$
$$\large{ m }$$ = mass $$\large{ lbm }$$ $$\large{ kg }$$

Tags: Energy Equations