Hydrogen can be converted to a solid by decresing its temperature below the melting point of 14.01 Kelvins (about -260 degrees C). This was first achieved by James Dewar, a british chemist and physicist. He was able to do this following his inspiration to create a machine that allowed for such low temperatures. After his sucess in liquifying hydrogen in 1898, he successfully coverted it to a solid in 1899.
Yes, and if it ever becomes cost effective, it could be used to power a highly efficient green car. Such cars exist already, but are extremely expensive to manufacture. Hydrogen is placed in a storage container within the car, that holds the Hydrogen at a low pressure in solid form. Then, when the car needs fuel, the car heats the hydrogen, which returns to its gaseous state and is released into the fuel system. The main expense is the storage container–solid Hydrogen is extremely difficult to work with because its usual state at room temperature is gaseous.
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