#### Topic Content:

- Charles’ Law
- Experimental Verification of Charles’ Law
- Calculations Using Charles’ Law

Charles’ law states that the volume of a fixed mass of a gas is directly proportional to its absolute temperature provided the pressure remains constant.

OR

The volume of a fixed mass of gas at constant pressure increases by \(\frac{1}{273}\) of its volume at 0ÂșC for every degree Celsius or kelvin rise in temperature.

### Experimental Verification of Charles’ Law:

A mercury pellet is drawn into a clean dry capillary tube with the mercury adjusted to stay in the middle of the tube which is sealed at one end. Dry air is trapped between the pellet and the sealed end of the tube. The volume of the gas at any temperature is proportional to the length (volume) of the gas.

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