What is pressure in relation to a gas?

Question

a
the amount of particles bumping into each other
b
the force the gas is exerting on its container
c
the force an object exerts on a gas

Answer 1

The correct answer is:

b the force the gas is exerting on its container.

Pressure in relation to a gas is defined as the force that the gas molecules exert when they collide with the walls of their container.