boiling water does not increase in temperature when additional heat is applies because?

Answer 1

Boiling water absorbs heat. Any heat added will only make it boil faster, because the additional heat will be absorbed and will fuel the boiling process. This is why water cannot be heated beyond 100°C. Steam, which is water in the gaseous form, can be heated beyond 100°C, but it escapes, so you cannot heat it unless you contain it somehow.

This concept is used to cook foods faster; a "pressure cooker" is a large pot which becomes pressurized when the water inside is heated past the boiling point. Since there is nowhere for the steam to escape to, it can be heated beyond 100°C, so it cooks the food faster than boiling water would.

Answer 2

Once a liquid has reached its boiling point temperature, further addition of heat energy only serves to change the liquid into a gas, it does not raise the temperature.

In order to boil a liquid, energy must be put into the system to overcome the intermolecular forces of attraction between the molecules. This energy is in the form of the 'latent heat of vaporization', the [heat] energy which must be added to change the state of the material, but does not go into increasing its temperature.

It is entirely possible to have both liquid water at 100 degrees C, as well as have gaseous steam at 100 degrees C. Both are the same substance (H2O), both at the same temperate (100 degrees C), but the steam has more heat energy than the liquid water. The difference in energy is the latent heat of vaporization.

A very similar concept is at work when a liquid freezes into a solid (or a solid melts into a liquid)...using the latent heat of fusion.

Answer 3

The boiling point of water is the maximum temperature (at sea level) that the water can sustain a liquid form. Once it reaches the boiling point it must assume its gaseous form. Only then can the temperature of it increase.. Which is why steam can be made much much hotter. The only way to make it take more heat and remain a liquid is to increase the atmospheric pressure (such as in a pressure cooker).

Answer 4

The boiling point of water can be raised to approximately 230F.






Put it in a pressure cooker.

Answer 5

water doesn't change state after 100 degrees celsius.