How many degrees of water will boil How many degrees of boiling water

The temperature at which water boils is called the boiling point of water, and we usually say that "the boiling point of water is 100", which means that it is at one atmospheric pressure (standard atmospheric pressure).

The temperature at which the water boils. So is the boiling point of water set in stone? No. The boiling point of water is the pressure of the atmosphere.

The air pressure increases, and the boiling point increases. Because of the atmospheric pressure on the surface of the water, it is always necessary to stop the water molecules.

Evaporation, so when the air pressure rises, the water must have a higher temperature to turn into water vapor. Generally at low altitudes, atmospheric pressure is basically one atmosphere. Boiling water at a place below sea level (e.g., in a very deep mine) where the air pressure is higher than one atmosphere, and the boiling point of the water rises, and it has been determined that an increase in depth of one kilometer increases the boiling point of the water by 3 degrees.

Conversely, when the air pressure decreases, the boiling point decreases. For example, the higher the altitude, the thinner the air and the lower the air pressure, the boiling point of water in this place decreases. Mount Everest at the top of the world.

On the boiling water, as long as it is boiled, the water is boiled "boiled". Such "boiling water" does not cook the meal and does not kill certain bacteria. For this reason, geologists and mountaineers use high-pressure cookers – pressure cookers – when working in the mountains.

It is made using the principle of rising boiling point under high pressure. The sealed lid prevents the vapor inside the pot from escaping, so the air pressure increases, the boiling point increases, and the meal cooks quickly. Under normal use, the air pressure in the household pressure cooker is an atmospheric pressure, and the temperature is generally around 125.

When the air pressure inside the pot is too high, the safety valve on the pot.

It automatically turns on and releases a part of the vapor to reduce the air pressure.

The boiling of water is related to the air pressure of the water surface, boiling is the process of intense vaporization of water inside, and the formation of vaporization of water inside requires a certain amount of internal energy, that is, there must be a certain temperature, so that the bubble is not compressed in the rising process, but constantly vaporized and expanded, and bursts when it reaches the water surface, which is boiling. At a standard atmospheric pressure, i.e. at an altitude of 0 meters, the water vaporizes internally to form a boil, and the water temperature must reach 100 to boil. With the increase of altitude, the atmospheric pressure decreases, and the boiling point will decrease, at an altitude of more than 4000 meters, as long as it is more than 70 degrees, it will boil, and the pressure cooker will increase the internal pressure, and the boiling point is above 100 degrees.

The boiling point of water is related to atmospheric pressure. The temperature at which water boils is called the boiling point of water, and what we usually call "the boiling point of water is 100" refers to the temperature at which water boils at a standard atmospheric pressure.

The boiling point of water varies depending on the atmospheric pressure. The lower the atmospheric pressure, the lower the boiling point, and the higher the atmospheric pressure, the higher the boiling point. When water is evaporated as a liquid, it produces vapors.

When the pressure of the vapor is equal to the pressure of the outside, the pressure of the vapor has reached a state of saturation at this time. At this point, the water boils, and the temperature at which the water boils is the boiling point of the water.

When the external pressure increases, the pressure of the vapor will also increase, and at this time, the temperature needs to be raised to make the vapor pressure reach a saturated state, and at the same time, the boiling point of water will also increase, so the higher the atmospheric pressure, the higher the boiling point of water.

It can also boil at 0 degrees in the test tube!

Proper tips for boiling water:

When the water is about to boil (80-90 degrees Celsius), open the lid, wait for the water to boil for another 2-3 minutes, then turn off the heat. If you can't always get the right time for the water to boil, open the lid as soon as the water is boiling and wait another 2-3 minutes.

Reasons: 1. There are more and more organic pollutants in water now, and some substances are volatile and will volatilize with water vapor when heated. Therefore, when the water is about to boil, open the lid of the kettle and boil it for another two or three minutes after the water is boiling to allow these substances to be volatilized to the maximum.

2. If the water is boiled for too long, it will also cause the aging of the water and the formation of harmful substances. Therefore, healthy water that meets the needs of the human body should be fresh, and the boiling time should not be too long.

Hazards of not boiling water:

1. Fungal infection.

Unboiled water contains a lot of organisms, pathogens and viruses, the human body has a certain immunity, short-term drinking unboiled water will not cause physical discomfort, if you drink it often, it is easy to be infected with bacteria, causing acute and chronic gastroenteritis, bacterial diarrhea or malaria.

2. Increase the risk of cancer.

Most of the water drunk in the city comes from rivers and lakes, and then filtered and chlorinated by the waterworks to remove a large number of microorganisms and impurities in the water, and at the same time, there are still a lot of organic matter and chloride ions left in the water.

The above content reference: People's Daily Online-Can you drink unboiled water Do you know the correct way to boil water.

When the water is boiling, it is boiling.

At sea level at 45 degrees north latitude, at standard atmospheric pressure, the boiling point of water is 100. In other words, when the water is heated to 100, it will boil.

But the boiling point of water decreases as the air pressure decreases. The higher the altitude, the thinner the air, the lower the atmospheric pressure, the lower the temperature at which the water boils, and on the top of the Himalayas, it only needs to be heated to 72 when boiling water.

The altitude is different, the temperature is different, the higher the floating point at the altitude, the lower the floating point, and the normal situation is about more than 90 degrees

Looking at the altitude, the sea level should be 100 degrees, and the higher the altitude, the lower.

There is no fixed value for the temperature at which water boils (boiling point), because the boiling point is closely related to the air pressure, and the higher the air pressure, the higher the boiling point.

The boiling point of pure water is 100 only at one standard atmosphere (101325 Pascal or 760 mmHg).

When the air pressure is lower than one atmosphere, the boiling point of water will be below 100, so on the high mountains with an altitude of more than several thousand meters, the open pot cannot cook food, and a pressure cooker must be used. Because the air pressure in a pressure cooker can exceed one atmosphere, the temperature at which water boils exceeds 100.

Of course, the boiling point of water does not increase indefinitely, and when the water temperature is exceeded, no matter how much the air pressure increases, the water can only exist in a gaseous state, and this temperature is called the "critical temperature" of water.

The temperature at which water boils at a standard atmospheric pressure is 100 degrees Celsius.

The temperature of the water does not change during the boiling process.

When water boils, there is a continuous heating process, but the temperature of the water does not continue to rise. This is because the heat brought to the water by heating is converted into the internal energy of the water molecules, so that a large number of water molecules break free from the shackles of intermolecular hydrogen bonds and are converted into gaseous molecules, that is, gaseous water converted from liquid water to water vapor, and the heat is taken away.

So the temperature of the water does not rise.

After the water boils, it continues to absorb heat, while the temperature remains the same, this temperature is the boiling point, for example, at a standard atmospheric pressure, the boiling point of water is 100 degrees Celsius, and the boiling point is related to the air pressure.

Before reaching the boiling point, with heating, the temperature will rise, after reaching the boiling point, continue to heat, the water temperature will no longer rise, and the absorbed heat will make a large amount of water into water vapor.

The temperature of water boiling at standard air pressure is 100 degrees Celsius, but the boiling point increases when the air pressure increases.

The boiling temperature of water does not change because the process of changing from liquid to gaseous state in the process of boiling the liquid needs to absorb heat, because the liquid continuously absorbs heat. So the temperature does not change.

The temperature of the water does not change during the boiling process. The temperature at which the water boils, the increase in the pressure of the water.

The temperature at which water boils at a standard atmospheric pressure is 100 degrees Celsius, and the specific analysis is as follows:

Boiling is a phenomenon in which a liquid is heated beyond its saturation temperature, and violent vaporization occurs both inside and on the surface of the liquid. Different liquids have different boiling points. Even if it is the same liquid, its boiling point changes with the change of atmospheric pressure outside;

Water has a boiling point of 100 at a standard atmospheric pressure, which is the most common. Its boiling point also varies with the outside air pressure: the higher the atmospheric pressure, the higher the boiling point of the liquid, and vice versa;

Therefore, at one standard atmospheric pressure, the temperature at which water boils is 100 degrees Celsius.

Under normal circumstances, in our life, the temperature of water can reach up to 100 degrees, and if the temperature is higher, the water will boil and become water vapor, and the lowest temperature of water is 0 degrees, and when the temperature is below 0 degrees, the water will solidify and turn 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 altitude is 1500 meters, the boiling point of water is 95 degrees, the altitude is 2000 meters, the temperature of water is 93 degrees, the altitude of 3000 meters, the temperature of water is 91 degrees, the temperature of water at 4000 meters above sea level is 88 degrees, and the temperature of water at 5000 meters above sea level 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, 100 degrees is the highest temperature of water I have ever seen in my life.

The temperature at which the water boils is 100, and in the normal air pressure environment, the water temperature must reach about 100 if it wants to reach the level of boiling.

Boiling refers to the phenomenon that when the liquid is heated beyond its saturation temperature, the liquid is violently vaporized inside and on the surface at the same time. Different liquids have different boiling points. Rush to the head.