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RE: Airships - 1/26/2009 9:09:12 PM

Termyn8or

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HK, not hard to understand, I don't get the gist of what you said. And a vacuum will work just fine, but we don't have light enough materials strong enough to contain it.

I think "displacing a mass of air" is put correctly.Technically yes it does displace a volume of air, but the air's mass must equal or exceed the mass of that which is to be lifted. Actually by a bit more because helium does have some mass, hydrogen a bit less. A vacuum has no mass and would therefore be the most efficient, if only we could contain it without the container being so massive, regarless of it's volume. Basic principles of bouyancy, I don't see where I erred.

T

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RE: Airships - 1/26/2009 9:24:28 PM

rexrgisformidoni

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exactly. everything displaces something. even a rock sitting on dirt displaces the dirt it sits on, ie squishes it slightly.

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RE: Airships - 1/26/2009 9:32:58 PM

ThatDaveGuy69

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It's the same as displacement of water for a ship or submarine, just a little harder to picture because it's air.

Hmmmm... so a container, if rigid and light enough would float on air if it contained a vacuum...? Never considered it... Interesting...

~Dave

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RE: Airships - 1/27/2009 6:40:40 AM

Termyn8or

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Yes Dave, the main problem is that with helium the pressure can be equalized, but with a vacuum it obviously cannot.

T

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