Worked example

273 K→546 K doubles V at const P.

Charles’s Law

Volume-temperature direct at constant P.

Equation

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

Inline: $\frac{V_1}{T_1}=\frac{V_2}{T_2}$$

Variables

Symbol	Quantity	Unit	Notes
$V$	volume	L	—
$T$	temperature	K	—

Conditions and limitations

Constant P,n; T in K.

Rearrangements

$V_2=V_1 T_2/T_1$

Dimensional check: L/K conserved ✓

Worked example

273 K→546 K doubles V at const P.

Steps: write equation → substitute with units → check dimensional consistency → report with correct significant figures.

Common errors

• Using Celsius

Related resources

• gases-gas-laws topic
• Calculators — linked only when a real calculator implements this formula.
• Constants — sourced constants with version when values are required.

Sources

• NIST Physical Constants 2022 — CODATA.

Reviewed 2026-08-21 by Editorial Team; due 2027-08-21.