
Concept explainers
Interpretation :
Kinetic theory of gases must be used to explain the relationship between number density and gas pressure.
Concept Introduction :
Number density of gas is the number of gas molecules present per unit volume.

Answer to Problem 2E
Number density increases with increase in gas pressure.
Explanation of Solution
According to kinetic theory of gas
Here,
Here, V and m are volume and mass, R is universal gas constant.
Kinetic energy
Thus,
So at a particular temperature if Pressure is increased then volume will decrease and eventually number of mole n will increase.
Number density increases with increase in pressure.
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