others just irrelevant
Would you like to react to this message? Create an account in a few clicks or log in to continue.
Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Hi, I'm new here!
Playlists                     EmptyFri Nov 25, 2011 5:36 pm by heookaika

» Sex dating in north highlands california. Sex dating in mannsville kentucky.
Playlists                     EmptyThu Aug 04, 2011 11:36 pm by Guest

» Holistic And Alternative Veterinary Medicine
Playlists                     EmptyThu Aug 04, 2011 7:59 am by Guest

» Fxsystems Forex Broker located offshore
Playlists                     EmptyThu Aug 04, 2011 2:28 am by Guest

» прически начала 19 века
Playlists                     EmptyThu Aug 04, 2011 2:26 am by Guest

» Hi, I am new here.
Playlists                     EmptyWed Aug 03, 2011 8:46 pm by Guest

» This forum aid me thanks
Playlists                     EmptyWed Aug 03, 2011 4:38 pm by Guest

» tramadol veterinary dose
Playlists                     EmptyTue Aug 02, 2011 7:50 pm by Guest

» men and women and anal sex
Playlists                     EmptyTue Aug 02, 2011 6:24 am by Guest

Navigation
 Portal
 Index
 Memberlist
 Profile
 FAQ
 Search

Playlists

Go down

Playlists                     Empty Playlists

Post by lunamoonfang Thu Dec 16, 2010 2:08 pm

Pressure and thickness
Main article: Atmospheric pressure

The average atmospheric pressure at sea level is about 1 atmosphere (atm) = 101.3 kPa (kilopascals) = 14.7 psi (pounds per square inch) = 760 torr = 29.9 inches of mercury (symbol Hg). Total atmospheric mass is 5.1480×1018 kg (1.135×1019 lb),[10] about 2.5% less than would be inferred naively from the average sea level pressure and the Earth's area of 51007.2 megahectares, this defect having been displaced by the Earth's mountainous terrain. Atmospheric pressure is the total weight of the air above unit area at the point where the pressure is measured. Thus air pressure varies with location and time, because the amount of air above the Earth's surface varies.

If atmospheric density were to remain constant with height the atmosphere would terminate abruptly at 8.50 km (27,900 ft). Instead, density decreases with height, dropping by 50% at an altitude of about 5.6 km (18,000 ft). As a result the pressure decrease is approximately exponential with height, so that pressure decreases by a factor of two approximately every 5.6 km (18,000 ft) and by a factor of e = 2.718… approximately every 7.64 km (25,100 ft), the latter being the average scale height of Earth's atmosphere below 70 km (43 mi; 230,000 ft). However, because of changes in temperature, average molecular weight, and gravity throughout the atmospheric column, the dependence of atmospheric pressure on altitude is modeled by separate equations for each of the layers listed above. Even in the exosphere, the atmosphere is still present. This can be seen by the effects of atmospheric drag on satellites.

In summary, the equations of pressure by altitude in the above references can be used directly to estimate atmospheric thickness. However, the following published data are given for reference:[11]
_____________

Learn Spanish in Spain
xanogen oil

lunamoonfang
pengunjung
pengunjung

Posts : 118
Join date : 2010-12-07

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum