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Liquid water can exist at (and above) 100 degrees Celsius if the pressure is increased above one atmosphere (about 100 000 Pascals). The high pressure squeezes the molecules together, and does not allow them to separate into a gas. This forces it to remain as a liquid, despite the high temperature. Of course, water vapour (steam) can certainly exist above 100 degrees Celsius.

If you're interested in how the two phases exist together, if you heat water to 374 degrees Celsius and increase the pressure to 218 atmospheres, the properties of the liquid and the vapour merge together to form only one "supercritical fluid" phase.

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15y ago
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Q: Can both liquid water and steam exist at 100 degrees Celsius?
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