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Question

Which of the following is not used as a rocket fuel?

A
Synthetic rubber
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B
Liquid hydrogen
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C
Paraffin
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D
Liquid nitrogen
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Solution

The correct option is D Liquid nitrogen

Liquid Nitrogen is a liquid at very low temperature (-417 degrees Farenheit). At normal temperature it is a gas. So, fill your tank with liquid nitrogen. Then let it into your engine, where the heat from the the outside air turns the liquid nitrogen into a high-pressure gas and expands and can harness the expansion to push a piston, just like you harness the expansion of high-pressure burning gasoline. Meanwhile, the cold engine must draw in heat from the atmosphere to warm it back up.


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