How long does it take to get boiling water to change back?

Answer 1

We would need to know the following variable the questioner has omitted:

Specific heat of water (you can look that up - as I'd have to!),

Intended temperature rise,

Volume or mass of the water,

Rate of heat transfer.

Answer 2

It depends on many factors. It depends what mass is present. 1 drop of water will cool down instantaneously. 1 tonne will take considerably longer. It also depends on what temperature it is being cooled down to. If it were being cooled to 99 0C it would only take a 1 kg mass a few seconds but if it were to 10 0C it would take considerably longer. Another major factor is the temperature gradient between the water and the surroundings. If the ambient temperature is 30 0C, it would be impossible to cool lower than this but using the above examples, even to cool down a few degrees would take much longer than if the boiling water were surrounded by liquid helium.

The following are some of the variables which affect the rate of cooling and therefore the amount of time:

• The material from which the container is made.
• The shape of the container.
• The volume of boiling water.
• The ambient temperature to which the container/water is exposed.
• The amount of flow, or lack thereof, of air around the container and over water surface.
• Whether or not the water is stirred or agitated, and how much.
• Whether or not, and what other materials may be dissolved in the water.

Answer 3

As long as it takes to raise the temperature of the water to 212° F (100° C)

or other local boiling temperature. That's going to depend on the quantity

of water, its starting temperature, the atmospheric pressure at the water's

surface, the source of heat, the efficiency of heat transfer from the heat source

to the water, and the rate of heat loss from the water to the surroundings.

Answer 4

Please clarify; it isn't clear what you want it to change to.

Answer 5

It usually takes from 10-20mins