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Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at

1. 0°C
2. its critical temperature
3. absolute zero
4. its Boyle temperature

Correct answer: 0°C

Solution

According to Charles's law, the volume of an ideal gas increases linearly with temperature when pressure is constant. The fractional increase is based on the volume at 0°C, as this is the reference point for temperature changes in Celsius.

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