Interesting Scientific Facts about Water

Why can we not make water hotter when it is boiling?

When water is boiling, you can make it hotter, but not as a liquid. We cannot make water hotter than one hundred degrees Celsius, because it will turn into water vapor. But it is quite possible to make water vapor hotter than the temperature of boiling water.

If we continue boiling water, we are putting heat into it. We must not think that if the water cannot become hotter, the heat is lost. No. The heat goes into the water, and the water takes the form of a gas, and the heat still remains. Though the heat is not making the water hotter, it makes the water vapor hotter.

On the other hand, we must always remember that the boiling point of water depends on air pressure.

On the top of a high mountain, where the air pressure is lower, water boils at a lower temperature. At the Dead Sea, which is more than two thousand feet below sea level, and where the air pressure is higher, the boiling point of water is higher.

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Why does a full bottle keep heat longer than a bottle that is half full?

A bottle full of hot water contains more heat than a bottle that is only half full.

Different things require different amounts of heat to be raised to the same temperature.

Let us take some water and the same amount of any other substance, and make them five degrees hotter than they were before. We find that we have to put more heat into the water than into the other substance.

You need more time to heat water than to heat anything else, because you have to put more heat into it. So you need more time to cool water than anything else, because water has more heat in it which it must lose.

Of course, the more water we have, the more heat it contains.

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Is there any water in the Sun?

We are quite sure that there is no water in the Sun.

We know that there are both oxygen and hydrogen in the Sun, as they are on Earth. We also know that in the Sun, oxygen and hydrogen have a great attraction for each other, as they do on Earth.

But there is no water in the Sun, because the Sun is so hot that oxygen and hydrogen cannot combine there.