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When air is warmed up, its molecules move faster and faster and as a result they move further from each other. They still have the same mass, but they now occupy a larger volume. This means that its density is smaller.

The opposite when air is cooled off. The molecules slow down, get closer together, occupy a smaller volume and therefore its density is bigger.

When air is warmed up, it goes up. Once it's up there, is cools off and goes back down. Near the heated surface the air gets warmed up again, goes up, cools down, goes back down, and again and again.

That's called a convection cell.

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What happens to air pressure as you move away from earths surface?

Air pressure decreases as you move away from Earth's surface. This is because the weight of air above you becomes less as you move higher in the atmosphere, resulting in lower air pressure at higher altitudes.


How does atmospheric pressure change as you move away from the surface of earth?

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Air pressure is greatest at the Earth's surface, particularly in the troposphere, due to the weight of the air above pressing down on it. The air molecules are denser near the surface because gravity pulls them closer to the Earth, resulting in higher pressure. As you move higher in altitude, there are fewer air molecules above, leading to a decrease in pressure.


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Why is air preassuare greastest at the earths surface?

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Air is heated by conduction when it comes into direct contact with a warmer surface, such as the ground or a heated object. The heat energy is transferred from the surface to the air molecules through direct contact, causing the air molecules to gain kinetic energy and move faster, increasing the air temperature.


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Air above a cooled surface tends to sink as it becomes denser and cooler. This creates a downward flow of air which then spreads out horizontally, creating a circulation pattern known as a cold air drainage.


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The air just above the ground is typically heated by conduction, as the ground absorbs heat from the sun and transfers it to the air molecules in direct contact with the ground surface. This process creates warm air near the surface, which then rises due to its lower density compared to the surrounding cooler air.


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