| http://www.w3.org/ns/prov#value | - But it does have drawbacks such as the cost of liquefying it to make it useful as a transport fuel.???There are two ways to make it useful at present; one is to bring it down to a temperature which is below the boiling point of methane ??? about minus 164 degrees Celsius ??? or to compress it and hold it in a very thick steel cylinder.
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