Boiling was the act of vaporising a liquid.

The boiling point of water was much lower in a vacuum, so one's sweat, saliva and the fluid around their eyes would boil if exposed to outer space. (TV: Oxygen)

By the 26th century, the seas of Earth had been polluted, irradiated, set on fire and boiled off into a thick sludge. (PROSE: Ship of Fools)

The Outland Sea boiled away during the Ice Cap Wars. (PROSE: The Secret in Vault 13)

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