Concept:Pressure in kinetic theory is the force per unit area due to molecular collisions, where force equals the rate of change of momentum.
Explanation:Gas molecules moving randomly collide with the container walls and rebound.
Each collision causes a change in momentum,
Δp, transferred to the wall.
The total force exerted on the wall is the rate at which this momentum changes over time.
Mathematically, force is
F=timetotal change in momentum.
Pressure is this force divided by the area of the wall:
P=AF=arearate of change of momentum.Therefore, pressure is the rate of change of momentum imparted per second per unit area.
Answer:Option B.