02-02-2008, 08:38 PM
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#21
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The new goggles also do nothing.
Join Date: Oct 2001
Location: Calgary
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It depends on where you draw the line. The troposphere is only 8 to 16 km thick, and the stratosphere goes up to 60km.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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02-02-2008, 08:47 PM
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#22
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Franchise Player
Join Date: Oct 2002
Location: not lurking
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Quote:
Originally Posted by photon
It depends on where you draw the line. The troposphere is only 8 to 16 km thick, and the stratosphere goes up to 60km.
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Yeah, not to nitpick but they said atmosphere, which includes the thermosphere, which is measured in the hundreds of kms. Obviously if they choose to just show a quarter of the atmosphere, then they can make a surprisingly small ball, but it's not accurate. My estimate was actually extremely conservative, and one could easily argue that it should be over 20 times the volume of their sphere.
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02-02-2008, 09:02 PM
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#23
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The new goggles also do nothing.
Join Date: Oct 2001
Location: Calgary
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Yeah, you could count up to 500km out or more.
__________________
Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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02-02-2008, 11:32 PM
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#24
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#1 Goaltender
Join Date: Nov 2002
Location: Richmond, BC
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I did some very rough back of the envelope calculations and came up with a sphere of radius 800km containing two billion cubic km of water. I used a mean water depth of 5km.
Sounds about right. The 6000 number for the radius of the earth makes the numbers easier and it makes up for the surface area of the land, so they sort of cancel out a bit.
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"For thousands of years humans were oppressed - as some of us still are - by the notion that the universe is a marionette whose strings are pulled by a god or gods, unseen and inscrutable." - Carl Sagan
Freedom consonant with responsibility.
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02-02-2008, 11:43 PM
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#25
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Lifetime Suspension
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Looks about right, i remember in school that the mass of the atmosphere was roughly twice that of water and water makes up roughly 0.02% of the the earths mass.
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02-03-2008, 01:08 PM
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#26
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tromboner
Join Date: Mar 2006
Location: where the lattes are
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If the ball contains all the water, then why are Greenland and the Arctic white?
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02-03-2008, 01:38 PM
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#28
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Redundant Minister of Redundancy
Self-Banned
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That's not topical at all. Freaking cool though.
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02-03-2008, 01:50 PM
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#29
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Franchise Player
Join Date: Oct 2001
Location: Clinching Party
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nm
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02-05-2008, 10:03 PM
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#30
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Franchise Player
Join Date: Oct 2001
Location: Clinching Party
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02-06-2008, 01:03 AM
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#31
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First Line Centre
Join Date: Apr 2004
Location: Boxed-in
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I didn't check the assumptions behind those pictures, but if you compressed all of the upper atmosphere into the volume it would occupy at 1 ATM of pressure, then perhaps that's what they're getting at. Obviously that would be much smaller than the actual "volume" of the atmosphere...which is really quite unlimited when you include the expansion at low pressure.
My $0.02.
As for the water, my guess was that the "ball" would be about 1/3 of the size it is....but I was wrong. The oceans are very, very shallow compared with their area. The Pacific is more than 15,000 km wide, and no deeper than 11 km at its lowest point. That's 0.07% ... like someone said, like the skin of an apple.
Quote:
Originally Posted by octothorp
Yeah, not to nitpick but they said atmosphere, which includes the thermosphere, which is measured in the hundreds of kms. Obviously if they choose to just show a quarter of the atmosphere, then they can make a surprisingly small ball, but it's not accurate. My estimate was actually extremely conservative, and one could easily argue that it should be over 20 times the volume of their sphere.
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Last edited by Cube Inmate; 02-06-2008 at 01:12 AM.
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02-06-2008, 09:56 AM
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#32
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Not the 1 millionth post winnar
Join Date: Aug 2004
Location: Los Angeles
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If all the water on earth is in that little ball, then how come Greenland is covered in snow? Or is ice excluded?
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02-06-2008, 10:07 AM
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#33
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The new goggles also do nothing.
Join Date: Oct 2001
Location: Calgary
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Probably just an oversight on whoever made the image.
__________________
Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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02-06-2008, 10:19 AM
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#34
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First Line Centre
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My guess was right on I guessed that exact diameter.
However I just did those calculations in a Geog lab about 2 hours ago 
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