Eli5 what would happen if you had water in a completely sealed container and brought it past boiling temp

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Would it just turn into a pressurized container full of steam? Would the water stay water but just like, really hot?

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There would be some steam but mostly, it would stay as water.

The boiling point of water increases as pressure increases. So after a little water becomes steam which increases the pressure, the rest will remain as liquid.

If you continue heating the water past its *new* boiling point the water will turn into steam and the pressure will get higher and higher. Any real-world container will blow up.

Because the water is above its normal-pressure boiling temperature, as soon as the container breaks it’s going to very rapidly turn into steam and basically explode. This is called a BLEVE (boiling liquid expanding vapor explosion) and is extremely dangerous.

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