Sage-Tips

Why is high pressure found in cold region?

♦High pressure found in Cold region The north polar high being the stronger one because land gains and loses heat more effectively than sea. The cold temperatures in the polar regions cause air to descend to create the high pressure.

Why air pressure is high at North and South Pole?

(iv) Polar High-Pressure Areas At the North and South Poles, between 70° to 90° North and South, the temperatures are always extremely low. The cold descending air gives rise to high pressures over the Poles.

Why is air pressure higher in the winter?

In the winter, barometric pressure is often higher than the summer since cold air is denser than warm air.

Does cold air mean high pressure?

Cold air is more dense, therefore it has a higher pressure. Warm air is less dense and has a lower pressure associated with it.

What is Polar high pressure?

Polar high pressure areas The cold descending air gives rise to high pressures over the Poles. These areas of high pressure are known as the Polar Highs. These regions are characterised by permanent Ice Caps.

Why is air pressure generally lower over equatorial regions than it is over polar regions?

Why is air pressure generally lower over equatorial regions than over polar regions? because the sun is heating it directly. when a warm air mass and a cold air mass collide and neither one is able to push the other one out, steady rainfall for days.

Why is air pressure lower in winter?

Warm air is less dense, and therefore lighter, than cold air, so changes in temperature at various levels in the atmosphere result in changes in the pressure near the ground.

What is the air pressure higher?

The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude.

Why does air pressure decrease as you move higher in the atmosphere?

As altitude rises, air pressure drops. Earth’s gravity pulls air as close to the surface as possible. The second reason is density. As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level.

What does high pressure mean?

High pressure means the air pressure at a location is higher than at all surrounding locations; low pressure, the air pressure is lower. High pressure areas are usually associated with fair, dry weather; lows with clouds and precipitation.

Why is air pressure lower at the poles?

The cold temperatures in the polar regions cause air to descend to create the high pressure (a process called subsidence), just as the warm temperatures around the equator cause air to rise to create the low pressure intertropical convergence zone. Closely related to this concept is the polar vortex.

Why are polar high pressure areas high pressure?

That is, the polar highs are high pressure because it’s really cold and cold air sinks, and the equator is really hot and hot air rises. At the poles, the cold air flows towards the warmer temperate zones and eventually warms sufficiently to rise, producing a low pressure area.

Why is the barometric pressure higher at the Poles?

The descending air causes high pressures, called the polar highs. The south polar high is stronger than the north because it is over land. Cold air is more dense than warm air, & hence, the barometric pressure will be higher at the poles than at the equator.

What is the difference between a polar high and polar low?

But in addition to what Fred mentioned (good stuff, btw) there are two polar highs and the equatorial low, which are thermally produced. That is, the polar highs are high pressure because it’s really cold and cold air sinks, and the equator is really hot and hot air rises.

Why is the south polar high stronger than the north polar high?

The south polar high is stronger than the north because it is over land. Now the ideal gas law is PV=nRT, n is the number of moles of the gas, and you correctly note that this implies, if V is fixed, that P would be higher for the hotter air at the equator than for the colder air at the poles.