The exact composition of natural gas (and the LNG formed from it) varies according to its source and processing history. And, like methane, LNG is. odorless, colorless, noncorrosive, and nontoxic. Natural gas is condensed to a liquid by cooling it to about -260Â°F (-162Â°C). This. process reduces its volume by a factor of more than 600âsimilar to reducing the. natural gas filling a beach ball into liquid filling a ping-pong ball (Figure 3).