The particles of a gas are free to move randomly in all directions. During the motion they collide with each other and also with the walls of container.

Gas Pressure in a Container
Gas molecules are in constant random motion. When gas molecules collide with the walls of a container, they exert a force on the walls. This force per unit area is what we refer to as gas pressure.

Explanation of Gas Pressure
- Gas pressure is caused by the collisions of gas molecules with the walls of the container.
- When gas molecules collide with the walls, they transfer momentum to the walls, resulting in a force.
- The force exerted by the gas molecules on the walls over a given area is what we measure as pressure.

Impact of Gas Particle Speed
- The pressure exerted by a gas is directly proportional to the speed of the gas particles.
- As the speed of the gas particles increases, the frequency and force of collisions with the walls also increase, leading to higher pressure.

Effect of Gas Particle Density
- The pressure of a gas is also influenced by the density of gas particles in the container.
- A higher density of gas particles means more collisions with the walls, resulting in greater pressure.

Temperature and Gas Pressure
- Increasing the temperature of a gas increases the kinetic energy of the gas particles, leading to more frequent and forceful collisions with the walls.
- This increase in collisions results in higher gas pressure.
In conclusion, gas exerts pressure on the walls of a container due to the constant collisions of gas molecules with the container walls, transferring momentum and creating a force per unit area. Factors such as gas particle speed, density, and temperature play a significant role in determining the pressure exerted by a gas in a container.