Water from asteroids could be broken down in space to liquid oxygen and liquid hydrogen for rocket fuel.

BBC: Plans for asteroid mining emerge

In its liquid form, it occupies much less space than gas, making it easier and more cost effective to transport.

BBC: The LNG terminal near Milford Haven in Pembrokeshire

Worms have survived their first space mission - living in liquid.

BBC: Liquid-living worms survive space

Since all the pore space is filled, pressure builds until the ice turns to liquid.

BBC: Doubts over water on Mars

We learn why water, unlike most of the substances we run into on Earth, is denser in its liquid than in its solid form (H2O molecules are kinked rather than straight, so the space between them increases when water is quiescent).

FORBES: The Story Of Eau