Gas mai ruwa-ruwa, ko LNG a takaice, iskar gas ce wacce aka sanyaya zuwa yanayin ruwa don dacewa da ajiya da wucewa. Yin amfani da masu musanya zafi na cryogenic, iskar gas yana shayar da shi lokacin da aka sanyaya shi zuwa kusan -260°F (-161.5°C), yana sa ya zama sauƙin sarrafawa.