What is a strong pressure gradient?
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.
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.
- The relationship between the two is that air temperature changes the air pressure. For example, as the air warms up the molecules in the air become more active and they use up more individual space even though there is the same number of molecules. This causes an increase in the air pressure.
- The speed of that wind can be measured using a tool called an anemometer. An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed.
- 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.
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 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 pressure difference between two locations is called a pressure gradient, and the force that actually moves air as wind is called the pressure gradient force. Earth's rotation means that air does not circulate in a single-cell convection current for each hemisphere.
- 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.
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.
- 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.
- Changes in temperature cause changes in air pressure. As the air near the surface of the earth becomes warmer, the particles becomes warmer, the the particles of the air move farther apart. It pushes down harder on the earth's surface than warm air does. Therefore, a cold air mass is called a high-pressure area.
- Wind turbines convert the kinetic energy in the wind into mechanical power. This mechanical power can be used for specific tasks (such as grinding grain or pumping water) or a generator can convert this mechanical power into electricity to power homes, businesses, schools, and the like.
Updated: 3rd October 2019