It doesn’t necessarily; it depends on the temperature.
Pressure is the collision of gas molecules with the sides of a container. All gas molecules not at absolute zero (read: all molecules in gas form) therefore exert some sort of pressure on their container. Depending on the volume of the container, the temperature, and the number of moles of gas inside the container, the prssure may or may not be greater than atmospheric pressure, leading you to perceive a tangible greater pressure inside the container.
If you think about the world at a molecular level, there is really only one thing separating solids from liquids from gases: the speed at which the molecules of a substance or an object are moving. Solids are made up of molecules that barely move at all, while liquids are made of molecules that move with more speed and frequency, and gases are composed of molecules that move very rapidly. When you put a gas into a container, the molecules still move very fast, but not as freely as they would in an open space. The gas molecules collide with the the surface of the container, exerting pressure on the inside of the container. If you increase the temperature of the gas, the molecules will move faster and the pressure will be greater.
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