How is wind and air pressure related?
When warm air rises, cooler air will often move in to replace it, so wind often moves from areas where it's colder to areas where it's warmer. The greater the difference between the high and low pressure or the shorter the distance between the high and low pressure areas, the faster the wind will blow.
The Relationship Between Pressure Gradient & Wind Speed. The pressure gradient is the change in barometric pressure over a distance. This is because higher-pressure air always moves toward air of lower pressure in an attempt to gain balance within the atmosphere. Steeper gradients result in a stronger push.
- Boyle's Law states that if the temperature remains the same and the pressure changes, the volume of the gas in the balloons will decrease as pressure is increased and will increase as pressure is decreased. Gay-Lussac's Law states that the pressure is directly proportional to the Kelvin temperature.
- The motion of air in the atmosphere above our heads plays a large part in the weather we experience here at earth's surface. Basically, air cools as it rises, which can cause water vapor in the air to condense into liquid water droplets, sometimes forming clouds and precipitation.
- Air pressure changes with altitude. When you move to a higher place, say a tall mountain, air pressure decreases because there are fewer air molecules as you move higher in the sky. Relative humidity is the amount of moisture the air can hold before it rains. The most it can hold is 100 percent.
The pressure-gradient force is the force which results when there is a difference in pressure across a surface. In general, a pressure is a force per unit area, across a surface.
- Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
- the result of Earth's rotation on weather patterns and ocean currents. The Coriolis effect makes storms swirl clockwise in the Southern hemisphere and counterclockwise in the Northern Hemisphere. force that explains the paths of objects on rotating bodies.
- Wind is air in motion. It is produced by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of various land and water formations, it absorbs the sun's radiation unevenly. Two factors are necessary to specify wind: speed and direction.
The surface map indicates the surface winds and direction on the barbs and the isobars, lines of constant pressure. Notice how tightly packed the isobars are off the Eastern Seaboard. A strong pressure gradient exists and strong winds are blowing.
- A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location. The temperature gradient is a dimensional quantity expressed in units of degrees (on a particular temperature scale) per unit length.
- The pressure-gradient force is the force which results when there is a difference in pressure across a surface. In general, a pressure is a force per unit area, across a surface.
- The gradient wind is defined as a horizontal wind having the same direction as the geostrophic wind but with a magnitude consistent with a balance of three forces: the pressure gradient force, the Coriolis force, and the centrifugal force arising from the curvature of a parcel trajectory.
Updated: 3rd October 2019