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Science Forum Index » Space - Shuttle Forum » Two questions regarding hydrogen...
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| Alan Erskine... |
 Posted: Thu May 08, 2008 10:20 am |
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1 What is the mass of LH2?
2 How much volume would 1kg of LH2 take up once it became a gas (at sea
level pressure). |
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| Alan Erskine... |
| Posted: Thu May 08, 2008 10:46 am |
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"Alan Erskine" <alan.erskine at (no spam) bigpond.com> wrote in message
news:kTEUj.8711$ko5.109 at (no spam) news-server.bigpond.net.au...
Quote: 1 What is the mass of LH2?
2 How much volume would 1kg of LH2 take up once it became a gas (at sea
level pressure).
It's OK - I found it.
For those who don't know...
Hydrogen gas has a density of 0.08988 g/L
and LH2 has a density of 70.99 g/L
Which means there are 789.831 litres of gaseous hydrogen in one litre of
liquid hydrogen. |
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| Brian Gaff... |
| Posted: Thu May 08, 2008 2:15 pm |
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Ah, I see, but I wonder what energy is taken to make the hydrogen cold
enough in the first place, compared to the hydrogen you end up with, so to
speak.
I mean, if you were making your own fuel some place, and you needed to
liquefy it, then how much more hydrogen would you need to make it cold
enough. My brain hurts. No more perpetual motion discussions please.
Brian
--
Brian Gaff - briang1 at (no spam) blueyonder.co.uk
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Alan Erskine" <alan.erskine at (no spam) bigpond.com> wrote in message
news:NfFUj.8712$ko5.1991 at (no spam) news-server.bigpond.net.au...
Quote: "Alan Erskine" <alan.erskine at (no spam) bigpond.com> wrote in message
news:kTEUj.8711$ko5.109 at (no spam) news-server.bigpond.net.au...
1 What is the mass of LH2?
2 How much volume would 1kg of LH2 take up once it became a gas (at
sea
level pressure).
It's OK - I found it.
For those who don't know...
Hydrogen gas has a density of 0.08988 g/L
and LH2 has a density of 70.99 g/L
Which means there are 789.831 litres of gaseous hydrogen in one litre of
liquid hydrogen.
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| Alan Erskine... |
| Posted: Thu May 08, 2008 4:27 pm |
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"Brian Gaff" <briang1 at (no spam) blueyonder.co.uk> wrote in message
news:hjIUj.196$DZ6.160 at (no spam) text.news.virginmedia.com...
Quote: Ah, I see, but I wonder what energy is taken to make the hydrogen cold
enough in the first place, compared to the hydrogen you end up with, so to
speak.
I was wondering that myself - how much energy (specifically electricity)
does it take to liquify 1m3 of gaseous hydrogen?
Quote:
I mean, if you were making your own fuel some place, and you needed to
liquefy it, then how much more hydrogen would you need to make it cold
enough. My brain hurts. No more perpetual motion discussions please.
Brian
Man, I've been working on this for a couple of hours - my brains numb! (more
than usual) |
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