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Charles's Law states that at constant pressure, the volume of an ideal gas is directly proportional to its absolute temperature (in Kelvin). V₁/T₁ = V₂/T₂. Heating a gas at constant pressure makes it expand.

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1. 1Always convert temperatures to Kelvin: K = °C + 273.15
2. 2Record V1 and T1; identify desired T2
3. 3V2 = V1 × T2 / T1
4. 4Pressure must remain constant

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