what is the difference between high atmospheric pressure and low atmospheric pressure?

Question

kindly tell me all about them.PLEASE MENTION THE WEATHER CAUSED BY THESE PRESSURES ALSO.

Answer 1

It is basically a measurement of how 'thick' or 'heavy' the atmosphere is - you measure it by seeing how much mercury (traditionally) the air can push up. (this about blowing into a straw into a closed bottle and pushing water up (or down) further by how hard you blow).

Low pressure is usually wet, windy and very low pressure is called depression which at the extreme becomes a hurricane/tropical storm.

High pressure is usually dry and clear - can be hot or cold depending on where the air is moving from. In my part of the world we get cold, dry high-pressure systems from the arctic sometimes during the winter.

http://en.wikipedia.org/wiki/Pressure_system

Answer 2

krithika

Crazy gave You a complete answer. I will only add common sense tips. At sea side areas, beaches, the level or elevation is the same as oceans, the lower level, over earth, that means the higher atmospheric pressure.

By the contrary, at the Himalayas, the Andes mountains and any other height land, that means lower atmospheric pressures.

Under atmospheric disturbances, like hurricanes, tornadoes, tsunamis, the atmospheric pressure behaves different.
For example, over the oceans or near the coastal regions, where the higher pressure is, if a vacuum is originated by a storm, hurricane, the pressure can low drastically, and this vacuum effect will attract clouds, wet masses of air, and a lot of wind forces, all main actors on a hurricane, typhoon or tropical storm. It is said that in the "eye" of a hurricane, there is a void, surely with a very low pressure, or a vacuum effect. As the lowest is the pressure or highest the vacuum, the storm or hurricane is stronger. All these processes are temporal (fortunately), because under normal conditions, at the sea level, you will have always the higher atmospheric pressure, and at the higher lands or mountains, You will have the less atmospheric pressure.

Answer 3

High pressure/low pressure really don't have anything to do with temperature. High pressure is when the air sinks, creating greater pressure down here on the ground. Since the air cannot rise, clouds generally cannot form. That is why it is generally sunny. Low pressure is just the opposite and is usually stormy. Now you can have an artic high pressure that comes from the north that will be very cold and you can have a tropical low pressure that will be very warm. That is why temperature is usualy not a determinate of high and low pressures.

Answer 4

Atmospheric pressure is the pressure at any point in the Earth's atmosphere.

In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.

Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location.
Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air 1 square inch in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 lb. A 1 m² column of air would weigh about 100 kilonewtons (a mass of 10.194 tonnes).

In the United States, compressed air flow is often measured in "standard cubic feet" per unit of time, where the "standard" means the equivalent quantity of air at standard temperature and pressure. However, this standard atmosphere is defined slightly differently: temperature = 68 °F (20 °C), air density = 0.075 lb/ft³ (1.29 kg/m³), altitude = sea level, and relative humidity = 0%. In the air conditioning industry, the standard is often temperature = 32 °F (0 °C) instead. For natural gas, the petroleum industry uses a standard temperature of 60 °F (15.6 °C).

Answer 5

air flow from high atmospheric pressure area to low atmospheric pressure ....
Cause of low atmospheric pressure is generally hot temperature ..........
high atmospheric pressure its a relative term ...
If high atmospheric pressure area is above sea(wind with moisture) then it carries rain water and in low atmospheric pressure area it causes rain ........
Except it also cause thunder some time

Answer 6

high pressure = generally good weather and few clouds

low pressure = generally nasty weather including high winds and precipitation and stratus clouds.

Standard reference pressure is 29.92 in hg or 1013 millibars.

Answer 7

one is higher and one is lower