What causes air to go down a mountain?

…of such winds, known as mountain winds or breezes, is induced by differential heating or cooling along mountain slopes. During the day, solar heating of the sunlit slopes causes the overlying air to move upslope. These winds are also called anabatic flow.

What causes the air to warm as it moves down a mountain?

As air rises over a mountain it cools and loses moisture, then warms by compression on the leeward side. The resulting warm and dry winds are Chinook winds. The leeward side of the mountain experiences rainshadow effect.

What decreases as you go up a mountain?

As you climb a mountain, you can expect the air temperature to decrease by 6.5 degrees C for every 1000 meters you gain. This is called the standard (average) lapse rate.

What happens when air hits a mountain?

When air reaches the mountains, it is forced to rise over this barrier. As the air moves up the windward side of a mountain, it cools, and the volume decreases. As a result, humidity increases and orographic clouds and precipitation can develop.

What happens to warm moist air as it rises over the mountain?

If warm moist air rises, it will expand and cool. As it cools, the relative humidity will increase and water will condense. It can then fall back to the earth as precipitation. … As air rises, it expands because there is less atmospheric pressure at higher altitudes.

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Why pressure is low at high altitude?

At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. … Since most of the atmosphere’s molecules are held close to the earth’s surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels.

Is there less oxygen at higher altitudes?

As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. … The human body reacts to high altitudes. Decreased air pressure means that less oxygen is available for breathing.

What happens when air rises?

Hot air rises. As air rises, air pressure at the surface is lowered. Rising air expands and cools (adiabatic cooling: that is, it cools due to change in volume as opposed to adding or taking away of heat). The result is condensation/precipitation.

Do mountains affect wind?

Mountains make a barrier for moving air. The wind pushes air, and clouds in the air, up the mountain slopes. The atmosphere is cooler at high elevations, and there is less of it: lower pressure makes it hard for lowland animals to get enough air to breathe.

What happens when air cools?

Because each molecule uses more space for motion, the air expands and becomes less dense (lighter). … The opposite effect happens when air cools. As the temperature drops, molecules move more slowly, taking up less room. The amount of space the air takes up shrinks, or reduces the air pressure.

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