# Charles' Law

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Charles' law, one of the gas laws, states that at a constant pressure the volume of a given mass of gas is directly porportional, increases or decreases, to the absolute temperature.

## Charles' Law formula

$$\large{ \frac{V_i}{T_i} = \frac{V_f}{T_f} }$$  or  $$\large{ \frac{V_f}{V_i} = \frac{T_f}{T_i} }$$  or  $$\large{ V_i \; T_f = V_f \; T_i }$$
Symbol English Metric
$$\large{ T_f }$$ = final temperature $$\large{F}$$  $$\large{C}$$
$$\large{ T_i }$$ = initial temperature $$\large{F}$$ $$\large{C}$$
$$\large{ V_f }$$ = final volume $$\large{ft^3}$$ $$\large{m^3}$$
$$\large{ V_i }$$ = initial volume $$\large{ft^3}$$ $$\large{m^3}$$