Question

Explain what causes air pressure.

   Explain what causes air pressure.

Living by Chemistry

Living by Chemistry

Angelica M. Stacy 2nd Edition

Chapter 11, Problem 2

Instant Answer

Solved by Expert Marissa Turner

06/23/2020

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Explain what causes air pressure.

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Key Concepts

Molecular Collisions

Air pressure is caused by the continuous collisions of air molecules with surfaces and with each other. As these molecules move at high speeds, each collision transfers momentum to the surfaces they hit, creating a force per unit area known as pressure.

Kinetic Theory of Gases

The kinetic theory of gases explains that the properties of gases, including pressure, arise from the random motion of molecules. This theory links the temperature of a gas to the average kinetic energy of its molecules, indicating that higher temperatures lead to faster-moving molecules that increase the frequency and force of collisions, thereby raising the pressure.

Gravitational Compression

Gravity plays a key role in determining air pressure by compressing the atmosphere toward the Earth’s surface. This compression increases the density of air molecules near the ground, resulting in more frequent collisions and higher pressure compared to higher altitudes.

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