Part 6 of series about Hunter Gas Guns, or Cannons to the Planets. Part 5 here.
quote:
On average, a column of air one square centimeter in cross-section, measured from sea level to the top of the atmosphere, has a mass of about 1.03 kg and weight of about 10.1 N (2.28 lbf)Comment:
I put this up because I was wondering how much air pressure was needed to move a 100 gram ( about 3 oz) piece of ice through a tube. Evidently, even much less than 1 atmosphere will do the trick. Anyway, if 1 liter of highly compressed hydrogen at room temperature is spread out in a tube that was 150 feet long, how much pressure would still remain? It looks like much more than 1 atmosphere would still remain, if it began as 700 atmospheres, as I guesstimated in an earlier post.
By the way, according to Boyle's Law, the pressure is proportional to its volume. If you decrease volume, pressure decreases and vice versa. Intuitively, you know this is true. Just squeeze a gas, and it increases its pressure.
This would be the force that I propose that would push the cube forward at the escape velocity of the moon without melting the ice cube.
The idea is to place one of these in space and use it as a propulsion device. The amount of force applied to the ice cube in such a manner would yield an incredible amount of thrust for the amount of mass used. See link above at previous post for the calculations and discussion.
Update:
Just wanted to make note that: 1 kilowatt hour = 3, 600, 000 joules.
The approximate amount of energy required to make 1 liter of liquid hydrogen: 13, 700, 000 joules, or about 3.8 kilowatt hours.
For what it is worth.
Update:
The 3 oz ice cube would actually be a cylinder which is about 1.4 inches in diameter and 3.94 inches long.
That defines the inner diameter of the tube. That's because you want a tight fit.
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