# Why does water take up more space as steam than it does a liquid water?

Jun 8, 2018

Well condensed phases, solid, and liquids, have more or less constant density...

#### Explanation:

...whereas a GAS will uniformly fill whatever volume is available to it.

There is a marginal volume change when water melts...

${H}_{2} O \left(s\right) \rightarrow {H}_{2} O \left(l\right)$

And unusually liquid water is MARGINALLY MORE dense than ICE...and this is why ice-bergs float.

There is a MASSIVE volume change when water boils...

${H}_{2} O \left(l\right) \rightarrow {H}_{2} O \left(g\right)$