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 gasThe 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

What is absolute zero?(a) It is the minimum temperature that has been

1.	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 gasThe 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
Answer» 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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