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

Question

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

In: 98

Answer 1

At higher pressures liquids have to get hotter before they turn into a gas. Assuming the container doesn’t explode, the pressure would build as it heats up. This pressure makes it harder for more water to boil off, which allows the water to actually go above 100C. This continues until you can’t put in more heat, or all the water becomes high pressure steam.