Short-Question

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# What causes air rise and fall?

## What causes air rise and fall?

The most powerful force which causes air to rise and cool is the Sun. When the Sun heats the surface of the Earth, warming of the air above the ground takes place. This warm air rises and cools as it goes higher. At a certain point, condensation will occur and clouds will form.

## What is caused by air rising?

So that rising air gives rise to a low pressure system. This type of system typically creates clouds which can eventually cause rain. Winds are also produced as air travels from areas of high to low pressure.

What are three ways air rises?

There are three main ways by which uplift of air can occur: convection, front and orographic (mountain) uplift. In each case, the rising air is forced to cool by expansion, releasing condensation first as cloud, and if uplift and cooling continues, as rain, hail or snow.

### How does rising and sinking air cause mountain and valley winds What time of day do each occur?

During the day, the sun heats up mountain air rapidly while the valley remains relatively cooler. Convection causes it to rise, causing a valley breeze. At night, the process is reversed. During the night the slopes get cooled and the dense air descends into the valley as the mountain wind.

### What are the 4 mechanisms that cause air to rise?

4. Four mechanisms that can cause air to rise are orographic lifting, frontal wedging, -, and localized convective lifting.

What causes an increase in air resistance when falling?

Falling with Air Resistance. To keep the topic simple, it can be said that the two most common factors that have a direct effect upon the amount of air resistance are the speed of the object and the cross-sectional area of the object. Increased speeds result in an increased amount of air resistance.

#### What does it mean when a barometer is rising or falling?

NEXT PAGE. Barometers are used to predict the weather. ­A barometer measures air pressure: A “rising” barometer indicates increas­ing air pressure; a “falling” barometer indicates decreasing air pressure. In space, there is a nearly complete vacuum so the air pressure is zero.

#### When does a mass of air rise and fall?

When a mass of air takes up more space, it has a lower density. When you have a lower density fluid immersed in a higher density fluid, the lower density fluid rises and the higher density fluid falls. Think of air bubbles in water, as shown in the photo above. Think of a helium balloon. Think of a hot air balloon.

When does air resistance balance the force of gravity?

Eventually, the force of air resistance becomes large enough to balances the force of gravity. At this instant in time, the net force is 0 Newton; the object will stop accelerating. The object is said to have reached a terminal velocity. The change in velocity terminates as a result of the balance of forces.