[Nerys]

No hydrogen does NOT become liquid when compressed. NO there was NO liquid hydrogen in that tank on mythbusters. That tank would be UNABLE to sustain the pressures needed nor the temperatures needed to hold LIQUID hydrogen. Trust me there were NO liquid drops coming out of that tank because there was NO LIQUID in that tank.

you would need to drop the temps down to 20 kelvin (MORE THAN 400'f NEGATIVE) to get liquid hydrogen. it is VERY VERY difficult and expensive to make liquid hydrogen and EXTREMELY DIFFICULT to keep it liquid without tons of power and specialized equipment.

that tank ONLY contained mildly compressed hydrogen gas.

your nitrous system is a bad example. it was OXIDIZER not FUEL. our vehicles use a LOT more oxidizer than they do FUEL. just stick your hand over your air intake to see how much. what is it 14 to 1 or something like that?

Liquid hydrogen is what? around 70grams a liter. there are 453 grams in a pound.

those tanks hold a hell of a lot more than 6.4 liters IE as a liquid it would hold a whole lot more than a pound of hydrogen.

its JUST gas. no liquid.