Collisions between particles of a gas and the walls of the container cause the pressure in a closed container of gas
Factors that affect the pressure of an enclosed gas are its temperature, volume, and number of particles
Raising the temperature of a gas will increase its pressure if the volume of the gas and number of particles are constant
Reducing the volume of a gas increases its pressure if the temperature and number of particles is constant
Increasing the number of particles will increase the pressure of a gas if the temperature and the volume are constant