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What is absolute zero?

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in Physics – Class 11 by (74.2k points)
What is absolute zero?

(a) It is the minimum temperature that has been achieved

(b) It is the lowest temperature of air

(c) It is -273K

(d) It is the temperature at which an ideal gas will have zero pressure, assuming it stays a gas

The question was posed to me in a job interview.

This intriguing question comes from Thermal Properties of Matter topic in division Thermal Properties of Matter of Physics – Class 11

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Right choice is (d) It is the temperature at which an ideal gas will have zero pressure, assuming it stays a gas

Easiest explanation: Absolute zero has been defined as the temperature at which an ideal gas would have zero pressure, assuming it remains a gas till then. The temperature value is obtained by extrapolating the graph of Pressure vs Temperature till the straight line cuts the temperature axis. This gives us a value of -273.15°C. Note that this temperature hasn’t been achieved yet.

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