Why does water not boil at 100C when it is under high pressure?

Answer 1

the density has increased slightly..... you have changed the properties of the standing water and therefore changed it's boiling point... same principle as why running water don't freeze at 0 degrees but standing water does.

Answer 2

Water has a higher specific heat capacity about 4.186 kJ/kg than other materials. This means that it takes 41860 Joules of heat to raise 1kg of water by 1 degree.

Gold for example, has a heat capacity of about 0.129kJ/kg. This means that it takes less energy to raise its temperature than water.

Answer 3

It becomes more difficult to form bubbles of vapour throughout the liquid when the atmospheric pressure or the pressure of the container is higher. Boiling means that the molecules are breaking apart and forming vapour pockets not just on the surface. More energy is required if there is more pressure, therefore, a higher temperature is needed.

Answer 4

A liquid boils at a temperature at which its vapor pressure becomes equal to the pressure above its surface. Since you have increased the pressure to higher than normal atmospheric pressure, the water will not boil at 100oC, this is because the vapor pressure of the water at 100oC is now lower than the atmospheric pressure above the water's surface. In order for the water to boil its vapor pressure must be increased to at least the higher atmopsheric pressure. To do that you need to increase the temperature of the water since vapor pressure increases as the temperature of the water increases. This is why water will boil higher than 100oC at a higher than normal atmospheric pressure.

Answer 5

At a higher pressure, the gas (vapor) will have more density, therefore more atoms will go back from the vapor phase to the liquid phase, and it requires a higher temperature to reach equilibrium.

Answer 6

Yes. And lower temperature at lower pressure. Cooking times in water are longer

in cities at high altitudes, where air pressure is less, because boiling water is not

quite as hot as it is at lower altitudes.

Answer 7

Water under high pressure has a higher boiling point because pressure increases the energy required to break the intermolecular bonds in water molecules, resulting in a higher temperature needed to reach the boiling point. This is due to the fact that the pressure on the surface of the liquid increases the energy barrier for water molecules to escape into the vapor phase.

Answer 8

because these not much air in uder pressure areas, you see now get to it

Answer 9

because it takes a higher temperature for the vapor pressure to equal the higher external pressure.