# Air pressure and wind relationship advice

### How Does Temperature Affect Air Movement? by Molly Elliott on Prezi

You can wet your finger and hold it up to find the wind's direction. warm air does. Therefore, a cold air mass is called a high-pressure area. P is pressure,; V is volume; m is mass; R is the universal gas constant; T is temperature. Now, density, ρ = m / V. Which leads to the equation. The wind blows because of differences in air pressure from one location to another. Wind blows from areas of high pressure toward areas of low pressure.

One climbs up and stands on another's shoulders. The weight of the acrobat on top puts more pressure on the one below. Then another acrobat climbs up and stands on the second acrobat's shoulders. Now there's even more pressure on the acrobat on the bottom because he is under the weight of the two acrobats above him.

It's the same with air. Yes, air has weight, and probably more than you think. In fact, the weight of the air on your desk at school weighs about 11, pounds. That's about the same weight as a school bus!

Since air pressure pushes in all directions, the air pressure pushing up from under your desk balances out the air pushing down on it, so the desk doesn't collapse under the weight.

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Just like an acrobat with two people stacked on his shoulders would want to move to where there wasn't so much pressure on him, air moves from areas where the pressure is higher to where it is lower.

The difference in air pressure between two adjacent air masses over a horizontal distance is called the pressure gradient force. The greater the difference in pressure, the greater the force and the stronger the wind. The Coriolis effect and wind direction An important factor affecting the direction in which winds actually blow is the Coriolis effectnamed for French mathematician Gaspard-Gustave de Coriolis — InCoriolis discovered that a force appears to be operating on any moving object situated on a rotating body, such as a stream of air traveling on the surface of a rotating planet.

Because of the spinning of Earth, any moving object above the planet's surface tends to drift sideways from its course of motion.

Thus winds are deflected from their straightforward direction. In the Northern Hemisphere, the Coriolis effect tends to drive winds to the right. In the Southern Hemisphere, it tends to drive winds to the left. Words to Know Coriolis effect: A force exemplified by a moving object appearing to travel in a curved path over the surface of a spinning body.

Small-scale winds that result from differences in temperature and pressure in localized areas. Difference in air pressure between two adjacent air masses over a horizontal distance.

Friction and wind movement The Coriolis effect and pressure gradient forces are the only factors affecting the movement of winds in the upper atmosphere. Such is not the case near ground level, however. An additional factor affecting air movements near Earth's surface is friction.