Gas particles are light but they do have a mass, this means when they collide with something, they exert a force.
In a sealed container the gas particles hit the containers walls and create an outward pressure.
The pressure depends on how fast the particles are going and how often they collide and hit the walls.
An increase in kinetic energy due to an increase in temperature means they hit harder against the walls of the container so create more pressure.
Temperature and pressure are proportional.
If you put the same volume of gas in a bigger container there will be less pressure. A smaller container with the same volume of gas will create more pressure. This is because there is less space so they will collide more often with the walls of the container.
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