Posted by Jim Wilkins on February 15, 2010, 7:09 pm
That doesn't affect the combining masses on your spreadsheet, but it
does halve the volume:
The main site:
After four years of intense study the profs told us we were far from
being chemists yet, but we knew enough to understand the explanations
of how things really happened when we went to work.
Then it turned out chemistry had been oversold after Sputnik and there
were hardly any jobs, only one member of the class got one with
Dupont, "Life" magazine showed a photo of a chem Ph.D. who had covered
his entire ceiling with rejection notices.
I enlisted in the Army for their longest and hardest electronics
school. The four of us who graduated, out of >80, all had science
Daestrom, I lived near Portsmouth Navy Yard and had already seen
enough of the inside of subs before I was 10. It's funny how the Navy
lives on water and stays dry, the Army lives on land and stays wet.
Posted by Curbie on February 15, 2010, 9:34 pm
daestrom has never steered me wrong, so even though it didn't look
like it was going to correct anything, IT DID. Now the spread sheet is
right on the numbers, a square and plum foundation so now I'll push it
some more to see if there is any value to it.
My rough number Solar Ethanol spread-sheet looks good for .0125 gallon
per hour continuous (360gal over 120 days) which at first blush seems
Posted by harry on February 10, 2010, 8:26 pm
If you look at this bit you can see why they use hydrogen as rocket
Posted by Neo on February 11, 2010, 12:21 pm
If you live in a metro area in the USA - as much as 10%
of the gasoline being sold today is made of ethanol
(aka gasohol E10). The difference is energy density
of gasoline drops from 46.4 MJ/kg to 43.5MJ/kg when its
dilluted with 10% ethanol because ethanol has a lower
energy density of only 30 MJ/kg . The nice thing about
running a car on diesel is that one does not have to
consider that it might be dilluted with ethanol
so it is guaranteed to have an energy density
of 46.4 MJ/kg all the the time. .
Slightly off topic is a special type of Lithium battery chemistry
called an Lithium-Air Battery . In theory it can produce
5299 Wh/kg (including oxygen) and 11140 Wh/kg (excluding
oxygen) i can produce 40.1 MJ/kg . Gasoline has a
energy density 46.4 MJ/kg. Here is a promising battery
chemistry whose energy densities is comparable gas!.
A Lithium Air battery draw oxgen for the surrounding
atmosphere to uses as the anode substrate instead of
using a permanent rare element cathode like a Lithium
Ion battery does. The lithium-oxygen chemistry has a
a very high heat dissipation characteristics and one of
the engineering challenges is to reduce the risk of of
explosions. So far from the reports I've read the
experimental Lithium-Air cells are about the size of
a hearing aid battery.
 Energy Density - Wikipedia entry
Posted by Steve Ackman on February 12, 2010, 8:51 pm
Thu, 11 Feb 2010 04:21:30 -0800 (PST), Neo,
You think anti-gel ingredients have the same energy
as diesel? Or you just don't live in a climate where
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