Gas Pressure

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Particle Theory and Gases
For gases, the kinetic theory model explains that gas pressure is caused by the collisions between the particles and their container. This is called the outward pressure and is usually greater than normal atmospheric pressure outside the container.

When the temperature is increased, the gas particles move faster and the collisions become harder and more frequent. This means that the pressure also increases.
When the temperature is decreased, the gas particles move more slowly and the collisions are less hard and less frequent. This means that the pressure also decreases.

Decreasing the volume of a gas increases the pressure of the gas. The gas particles will have less room to move as the volume the gas occupies has been decreased. This means that they will collide more frequently with the walls of the container. Each time they collide with the walls they exert a force on them. More collisions mean more force, so the pressure will increase.

Gas volume and pressure
Gas volume and pressure can be increased by adding more gas or increasing temperature of the gas.

The effect of an increase in temperature on pressure and volume of a gas

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