What does pressure do to water when heated?

Question

Let's say you put pure water into an unbreakable container of some kind. Then you heated this container far beyond water's boiling piont, where it would normally change to steam under normal atmospheric conditions, but in this situation, it would be under great pressure, since there would be no where for the steam to expand. So would the water stay in a liquid state? Or would it turn to steam, and just be under very high pressure?

Thanks

Answer 1

The water would eventual reach its critical point. When water and steam reach the level of absolute pressure 3206.2 psia (221.2 bar) and a corresponding saturation temperature 705.40oF (374.15oC), the vapor and liquid are indistinguishable.

This level is called the Critical Point.

At the critical point there is no change of state when pressure is increased or if heat is added. At the critical point the water and steam can't be distinguished.

Answer 2

If the container was full of water at room temp and then heated up, then it would stay as a liquid, no matter how hot it got. The pressure would simply increase.
If there was any air at atmospheric pressure in the container, a small amount of the water would evaporate, increasing the pressure in the space. As temperature rose, more water would evaporate and fill the space, but not all of the water would evaporate, so you still have a majority of the liquid left. The bigger the air space, the more water that can potentially evaporate, and so the greater the chances of all of the liquid turning to a gas.
If there was a part of the container, which contained a vacuum, and the rest of the container held water, then even more water would evaporate. As the temperature increases, the amount of liquid would decrease.
Don't forget that steam is not water vapour, it is just condensed water (water vapour that has cooled and become a liquid again, forming small droplets).

Answer 3

Actually when you heat water to a certain temperature, called the critical point, under extreme pressure it transforms into what is called a super critical fluid.

The critical point for water is 647.096 Kelvin temperature at 22.064 Mega Pascals pressure. That is very hot and a lot of pressure!

A super critical fluid has the attributes of both a liquid and a vapor or gas but it has additional properties of solubility.

For example, when you create the super critical fluid of Carbon Dioxide it can be used to dissolve the caffeine out of coffee beans to make decaffeinated coffee.

The way you reach the critical point is that as you increase the temperature of the liquid its vapor pressure increases. As you increase the pressure the vapor pressure of the gas decreases. When the vapor pressure of the liquid and gas become the same you have reached the critical point and you then have a super critical fluid, and not a liquid or gas.

Hope this helps.

Answer 4

if it quite is the nice and comfortable water you writing approximately then it sounds like an air lock , a quick piece of hose pipe geared up between the chilly and heat faucets then turn the two faucets on, the stress interior the chilly faucet will push the nice and comfortable water back up the pipe and push the air lock out. An air lock is in simple terms air trapped interior the pipe simply by undesirable installation layout

Answer 5

pressure just lowers and heightens the bp, and you don't want high pressure steam. that's how you get hurt