O que é Liquefied natural gas?

Liquefied natural gas (LNG) is natural gas cooled to about $-162{}^{\circ}\mathrm{C}$, at which it is a liquid about six hundred times denser than the gas: it is shipped in insulated carriers, loses a small share to boil-off on the way, and is warmed back to gas (regasified) at the receiving terminal.