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run them under cool water
A lid that makes it whistle when the water is boiling (so that the kettle doesn't run dry). A handle that is designed to keep cool enough to lift the kettle without potholders.
shiny because its cool when after boiled also the black wouldnt cool as it attracts heat.
Evaporation.
When you make a cup of tea, you boil the water to between 90 and 100 degrees centigrade. The molecules in the liquid water are at a higher energy state and get to lose their energy quicker. The water in a bath is usually at 50 to 60 degrees and at a lower energy state therefore will lose its heat more slowly. The same effect is noticed if you use hot water to melt ice on a path rather than cold water. The hot water loses its energy quicker and would turn to ice quicker than the cold water.
Assuming you got that number off an electric kettle it is because that is how much power is needed to heat the water. The number of watts actually measure how much energy the kettle is designed to use. Water is very hard to heat compared to other liquids(or to cool). So it takes a lot of watts to get the kettle to heat the water.
The starting temperature will certainly affect the time it takes for water to freeze. By definition, the temperature will be the same for both the water that started warm as it is for the water that started cool when they both freeze. The time difference comes from going from warm (~85 degrees) to freezing (32 degrees) and from cool (~50 degrees) to freezing (32 degrees).
Put teabag in cup, boil kettle, let water cool for a bit, then pour it in.
water cools quicker because it evaporates. It's why you feel cool when the wind hits your wet skin in dry climate.
Cool the water down to 4 degrees C. Water is at its densest at 4 degrees, which is why the bottom of lakes will almost always be 4 degrees.
You can allow hot water to cool or you can heat cold water.
Boiling tea kettle loses water through vapourization mainly not by evoporation.