Water has the highest boiling point, so why is the boiling point of water relatively high?

So is the boiling point of water set in stone, the boiling point should be, the boiling point of water should be raised, and the water should be boiled there. Such "boiling water". Because of the atmospheric pressure on the surface of the water.

It is made using the principle of increasing the boiling point under high pressure, the thinner the air, the higher the boiling point. When the air pressure in the pot is too high, the air pressure will also be lower, and when some of the vapor is released, the boiling point will rise. Therefore, when the air pressure rises, it is necessary to use a high-pressure cooker - a pressure cooker to reduce the air pressure.

3 atmospheres to make the air pressure lower? No. Places below sea level (e.g. deep mines).

For example, the higher the altitude, the higher the temperature at which water can be converted into water vapor;

When you boil water on a 1,000-meter mountain, the temperature is generally around 125, and the atmospheric pressure is basically one atmosphere. 5, so the air pressure increases, and the air pressure in the pot is 1:

Let's say the water is on level ground.

0 meters above sea level) on the boiling point is 100 degrees Celsius, as long as it is burned to 73, the air pressure is higher than one atmosphere, the safety valve on the pot will automatically open, can not cook the meal, geologists and mountaineers work in the high mountains, always have to prevent the evaporation of water molecules, according to the measurement. Boil water on Mount Everest, the top of the world. The boiling point of water varies with the change in atmospheric pressure.

Principle. Example.

Conversely, the boiling point of water is increased by 3 degrees

Drop every 1000 meters.

At 6 degrees Celsius, the boiling point of water decreases: as the air pressure increases, the boiling point decreases, and we usually say that "the boiling point of water is 100". The sealed lid prevents vapors from escaping from the pot.

Under normal use, the meal cooks faster, and the depth increases by one kilometer, which refers to the temperature at which water boils at one atmospheric pressure (standard atmospheric pressure), and cannot kill certain bacteria The temperature at which water boils is called the boiling point of water. Generally, at a low altitude, the water is boiled "boiled".

The boiling point of water can be easily changed, both up and down

1. The boiling point of water will be reduced by dissolving substances with low boiling point (not reacting with water) or reducing the external pressure. For example, in highland places, the boiling point of water will be greatly reduced.

2. The boiling point of water will increase if a substance with a high boiling point is dissolved in water or the external pressure is increased. But the rise of the boiling point is not infinitely high, but there is a critical temperature, that is, the boiling point cannot exceed the critical temperature, such as the critical temperature of water is 374 degrees, beyond this temperature, there is no difference between liquid water and gaseous water.

Due to the high pressure on the seabed, it is normal for the water to rise above 100 degrees without boiling (the salt in the seawater also raises the boiling point of water, but it is clear that pressure is the core cause of the increase in the boiling point of water).

At one atmosphere, the boiling point of pure water is 100, but when there is a solute or an increase in pressure in the water, in general, the more solute or the greater the pressure, the higher the boiling point.

The boiling point of water is higher than that of hydrogen fluoride, and they can both form H bonds, but one water molecule can form 2 hydrogen bonds, and it is a network structure, of course, it is stable, so the boiling point is high. Because water has hydrogen bonds, which act stronger than van der Waals forces, water has a higher boiling point than methane.

The boiling point is the temperature at which the liquid boils, that is, the temperature at which the saturated vapor pressure of the liquid is equal to the external pressure. Boiling point refers to the temperature at which a pure substance boils at 1 standard atmosphere. The boiling point of different liquids is different.

The boiling point changes with the change of external pressure, and the low pressure is also the low boiling point.

Under normal circumstances, in our life, the temperature of water can reach up to 100 degrees, no matter how high the temperature is, the water will boil and become water vapor, the lowest temperature of water is 0 degrees, and when the temperature is below 0 degrees, the water will solidify into ice. This is all in our lives, that is, the maximum and lowest temperature of water at standard atmospheric pressure.

But in some special cases, the water temperature will still rise and will not vaporize or freeze, the boiling point of water is normally 100 degrees, but this boiling point will increase with the increase of pressure, when the pressure reaches 225 atmospheres, the boiling point of water is 374 degrees, this temperature is called the critical temperature, and the pressure is high, the water will vaporize.

And sometimes the maximum temperature of water in normal life does not reach 100 degrees, that is, the boiling point will be lower than 100 degrees, why is this? That is because the boiling point of water will also change with the change of altitude, under normal circumstances, when the altitude is 0 meters, the boiling point of water is 100 degrees normally, the boiling point of water is 1500 meters above sea level, the boiling point of water is 95 degrees, the liquid mass is 2000 meters above sea level, the temperature of water is 93 degrees at an altitude of 3000 meters, the temperature of water is 91 degrees at an altitude of 3000 meters, the temperature of water at an altitude of 4000 meters is 88 degrees, and the temperature of water at an altitude of 5000 meters is 83 degrees. So seeing the water boiling, it doesn't have to be 100 degrees.

So far, a German scientist in the world has found that the highest water temperature in a high-temperature hydrothermal vent at the bottom of the Atlantic Ocean has reached 464 degrees, which is also the highest temperature of water found in the world so far.

In the Soviet Union, a scientist discovered a kind of water, this kind of water does not boil at 100 degrees, it freezes at minus 40 degrees, and it is very sticky, which is really interesting, and this kind of water is called "polymeric water"! The world of water is still very interesting, and there are different forms, in my life, 100 degrees is the highest temperature of water I have ever seen.