Becuase the particles in air and the particles in gas clash into each other and sometimes they expand or/and squeeze/entangle together to create pressure.
-I think-
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Gas molecules are in constant random motion, colliding with each other and the walls of the container they are in. These collisions create a force per unit area, which we perceive as pressure. The more frequent and stronger the collisions, the higher the gas pressure.
To determine the gas pressure in a closed container, you can use a pressure gauge or a manometer. These devices measure the force exerted by the gas molecules on the walls of the container, which is directly related to the gas pressure. By using the readings from the pressure gauge or manometer, you can calculate the gas pressure in the closed container.
To find density using pressure and temperature, you can use the ideal gas law equation: density (pressure)/(gas constant x temperature). This formula relates the pressure, temperature, and density of a gas. By plugging in the values for pressure, temperature, and the gas constant, you can calculate the density of the gas.
Gas pressure is affected by factors such as temperature, volume, and the number of gas particles present. For instance, increasing the temperature of a gas will increase its pressure, while decreasing the volume of a gas will increase its pressure as well. Additionally, having more gas particles in a given space will lead to higher pressure.
Increasing the temperature, increasing the pressure, or adding more gas molecules will increase the volume of gas.
The pressure of moving gas decreases speed because as the gas expands into a larger volume, there is less pressure pushing on the gas molecules. This reduced pressure allows the gas molecules to spread out and move more freely, decreasing their overall speed.