Re: Shuttle lift-off questions
- From: "Randy Poe" <poespam-trap@xxxxxxxxx>
- Date: 5 Jul 2006 05:56:23 -0700
jmfbahciv@xxxxxxx wrote:
Question 2: One of the reporters, who was talking about the
reason for one of the delays (cracks in the insulation) said
that the fuel tank expands when emptied and contracts when filled.
This is counterintuitive to me. If the reporter is correct,
why does this happen? I'm assuming that filling the tank
decreases inside pressure?
I can't find a definitive answer as to whether it expands or
contracts when fueled. I found some stuff that talks about
it "expanding and contracting" during fueling, other stuff
that says it expands when filled, and other stuff that
mentions cryogenic fuel (liquid hydrogen and oxygen)
that is replaced with warm air as it empties.
Possibly it is that change of temperature that accounts
for what the reporter was saying.
Or the reporter could have got it backwards. Reporters
have been known to screw up science stories before.
- Randy
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