Charles's Law

Also known as volume temperature law

\frac{V_1}{T_1} = \frac{V_2}{T_2}

V₁ =

T₁ =

V₂ =

T₂ =

Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!

Learning zone

Jacques Charles's balloon experiments in the 1780s showed that at constant pressure, a gas's volume is directly proportional to its absolute temperature. Take a party balloon from a 22 °C room (295 K) into −18 °C air (255 K) and it shrinks by about 14%. The ratio only works in kelvin — formula.expert converts your °C or °F inputs automatically.

Charles's Law

\frac{V_1}{T_1} = \frac{V_2}{T_2}

Where

$V_1$ = Initial volume
$T_1$ = Initial absolute temperature
$V_2$ = Final volume
$T_2$ = Final absolute temperature

Missing one of these? Work it out first, then come back

Initial volume — Boyle's Law, Combined Gas Law
Initial absolute temperature — Gay-Lussac's Law, Combined Gas Law
Final volume — Boyle's Law, Combined Gas Law
Final absolute temperature — Gay-Lussac's Law, Combined Gas Law

Part of this formula set

The gas laws

5 formulasBoyle, Charles, Gay-Lussac, the combined law and the ideal gas law — each holding one property fixed, and how they collapse into PV = nRT.