Understanding The Distribution Of Atmospheric Pressure Across Blue Planet
Post on 12,July 2012   8:32 AM
By - Mr. Om Singh
views 7975

Air has weight and the column of air extending vertically over a given area on the earth's surface exerts pressure. This is called atmospheric pressure. Pressure is measured as a force exerted per unit area. The most commonly used unit of measurement of pressure is millibar (mb). One mb is equal to a force of 1000 dynes per square cm.Pressure is measured with the help of instrument called barometer.

Normally pressure in inversely related to temperature. Moreover, with the increase of elevation pressure also falls, just like temperature. The distribution of pressure is highly uneven and this is partly a result of the variation in distribution of temperature. Another major control of pressure is the dynamic factor caused by the rotation of the earth and the ascent and decent of the air. Under the thermal control the pressure tends to rise from equator to poles. At the same time the air in the equatorial regions is thrown away from earth while in the polar areas it is pulled inward. This factor adds to the influence of temperature in the sense that equatorial area will have a still lower pressure and the polar areas will have a still higher pressure. Thus two belts of the high pressure, one over each polar region and one belt of low pressure around the equator are produced. The air rising in the equatorial regions descends around the equator are produced. The air rising in the equatorial regions descends around 30 degree north and south and there are produced two belts of high pressure in the subtropical regions of the both hemispheres. Due to the rotation of the earth the air is pulled inwards in the Polar Regions and this causes a rarification of the atmosphere in the sub-polar latitudes thus producing two belts of low pressure centered around 60 degree north and south of both the hemispheres. Thus a total seven belts of pressure, the equatorial low, the subtropical high (two belts), the sub-polar low ( two belts) and the polar high( two belts) are produced on the Earth.

This pressure distribution system is called as planetary distribution pressure. This distribution assumes uniformity of surface conditions all over the earth. The pressure distribution under each such condition all over the earth. The pressure distribution all over the earth is determined by the two factors , the thermal factor and the dynamic factor. While the equatorial belt of low pressure and the polar belts of high pressure are mainly result of the thermal control., the subtropical belts of high pressure and sub polar belt of low pressure are primarily result of dynamic control.


Back
Comments ( 0 )
Add a comment
Your name: *
E-mail:
The content of this field is kept private and will not be shown publicly.
Title:


Related Articles

Prelims Online Test Series
UPSC 2026 Prelims Test Series Registration Link

REGISTRATION
BPSC 2025-26 (71TH) PRELIMS Test Series

REGISTRATION
PolyEyes Recent Updates
Most Recent Comments

Sir I've lost my admit card and I also forget my roll no

Please  help me in other ways 

by Vivek Tigga
From:JPSC 5TH Admit Card Download Link

Dear Sir,

After login when i click on attempt button to take test a error msg show "Test series ended", plesae resolve this issue.

by Tarani Kumar
From:BPSC 71ST Prelims Test Series Details

sir, my name is SWARUP ANAND, my DOB- 01/03/1984, my father’s name- SANTOSH KUMAR SRIVASTWA. I have loss my admit card. Please tell my roll number.

by SWARUP ANAND
From:Download BPSC 56TH-59TH Prelims Admit Card From www.bpsc.bih.nic.in

nice information

by Gulshan
From:Important Facts About Jharkhand

BPSC mains 56th-59th me Roll No. 119040 pass hai aur PT me fail. Mahabhrstachar hai. pls see it must

by KRISHNA KUMAR
From:Bihar Public Service Commission (BPSC) 2016-17 Prelims Expected Cut-off

I am thankful for PolyEyes for most authentic Online BPSC Test Series. These Test are life support for working Aspirant.

by Rahul Ranjan
From:BPSC 71ST Prelims Test Series Details

sir please tell the authenticity of this news .there is no such news on bpsc website and i heard 17 june as the exam date .please clarify the doubt

by Pushkar Verma
From:BPSC 63rd Prelims on July 1

r u providing test for BPSC in HINDI medium ?

plz intimate me through emails about BPSC test packages and details of packages and its rate. how many test and when it will be taken plz send details about ur package plans.

by Rajeev Ranjan Kumar
From:BPSC 71ST Prelims Test Series Details

Yes Test is available in Hindi as well English and Total Number of Test and Registration details already given above

by Help Desk
From:BPSC 71ST Prelims Test Series Details

Best thing im loving about This Test series is its Explanation part. Crisp and to the Point. Thanku Polyeyes.

by Tirath Sukla
From:BPSC 71ST Prelims Test Series Details
 
 
1/10
 
 
Get RSS Feeds
  • All Stories
  • Recently Published Stories
  • Most Viewed Stories
  • Just In Photos
  • Most Viewed Photos