Question
A real gas behaves like an ideal gas if its
A.
pressure and temperature are both high
B.
pressure and temperature are both low
C.
pressure is high and temperature is low
D.
pressure is low and temperature is high
Answer :
pressure is low and temperature is high
Solution :
A real gas behaves as an ideal gas when the average distance between the gas molecules is large enough so that (i) the force of attraction between the gas molecules becomes almost zero (ii) the actual volume of the gas molecules is negligible as compared to the occupied volume of the gas.
The above conditions are true for low pressure and high temperature.