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Air pressure lower at night due to sleeping?
BJU teaches Young-Earth Creationism. How can you be an OEC? [[User:Scorpionman|Scorpionman]] 19:32, 16 March 2007 (EDT)
BJU teaches Young-Earth Creationism. How can you be an OEC? [[User:Scorpionman|Scorpionman]] 19:32, 16 March 2007 (EDT)
:They definitely make fun of me sometimes. --[[User:Splark|Splark]] 02:34, 17 March 2007 (EDT)
:They definitely make fun of me sometimes. --[[User:Splark|Splark]] 02:34, 17 March 2007 (EDT)
== Air pressure lower at night due to sleeping? ==
:An interesting fact is that the air pressure in the in the US has been shown to be slightly--but measurably--lower at night, due to the large number of people who are asleep and hence [[breathing|exhaling and inhaling]] more slowly.
Where on earth did you get that? What's your source? I have to say I flatly don't believe it. Even if everyone in the ''world'' breathed in at the same exact instant and breathed out at the same exact instant, the total amount of air involved = 6 billion people × vital capacity of 5 liters = 30 billion liters = 3 ·10<sup>10</sup> liters.
If you assume the atmosphere is a sealed compartment with its bottom at sea level and its top at 1.5 kilometers, its volume is 500,000,000 km<sup>2</sup> · 1.5 = 750,000,000 km<sup>3</sup> = 7.5 · 10<sup>8</sup> km<sup>3</sup> = 7.5 · 10<sup>17</sup> m<sup>3</sup> = 7.5 · 10<sup>20</sup> liters. That means the volume of the atmosphere is 2.5 · 10<sup>10</sup> times as large as the total volume of the atmosphere. It could at the very most cause a change of 0.000000004 kPa which is not detectible, since diurnal variation due to other factors is about 0.1 kPa.
And that's only if everyone in the ''world'' breaths together at the exact same time. [[User:Dpbsmith|Dpbsmith]] 14:57, 29 March 2007 (EDT)