Gas particles are equally sized and do not have intermolecular forces (attraction or repulsion) with other gas particles. The gas particles move randomly in agreement with Newton's Laws of Motion. The gas particles have perfect elastic collisions with no energy loss. Pressure: The molecules of a gas are constantly moving and bumping into things. The force of the particles against whatever they bump into creates pressure. Pressure is defined as the amount of force pushing against a given area. How much pressure a gas exerts depends on the amount of gas. The more gas particles there are, the... Show more

Gas particles are equally sized and do not have intermolecular forces (attraction or repulsion) with other gas particles. The gas particles move randomly in agreement with Newton's Laws of Motion. The gas particles have perfect elastic collisions with no energy loss.

Pressure: The molecules of a gas are constantly moving and bumping into things. The force of the particles against whatever they bump into creates pressure. Pressure is defined as the amount of force pushing against a given area. How much pressure a gas exerts depends on the amount of gas. The more gas particles there are, the greater the pressure. You usually cannot feel it, but air has pressure. The gases in Earth's atmosphere exert pressure against everything they contact. The atmosphere rises high above Earth's surface and contains a huge number of individual gas particles. As a result, the pressure of the tower of air above a given spot on Earth's surface is substantial.

If you were standing at sea level, the pressure would be 10.14 newtons per square centimeter (14.7 pounds per square inch).

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