Can anyone tell me why the higher the air pressure, the higher the boiling point of the liquid

Microscopically speaking, the liquid state is the relatively tightly bound state of water molecules, the relatively stable state of intermolecular gravity equal to the repulsive force, and the relatively stable state of water molecules. Molecules are constantly moving, and the reason why they do not become free (gaseous) is because their own energy is not enough to resist external pressure (barometric pressure).But when their energy increases, they can swim freely (gaseous).

And the embodiment of energy is temperature. So the higher the energy (temperature), the stronger the molecule's ability to resist pressure (barometric pressure). So the higher the air pressure, the higher the boiling point of the liquid.

If you haven't studied molecular physics, it's a bit difficult to understand, but sooner or later you will learn it.

You can imagine that there is a group of lively small molecules, they are running around, scattered freely in various places (gaseous), but there is an evil force (pressure) that forces them to give up space, they can only gather together, movement is their nature, for the space they fight against the evil forces, if the molecules are strong (high energy, high temperature, large internal energy), each is superhuman, they are still running around, freely scattered everywhere (gaseous), if the molecules are mediocre (average energy), the evil force (air pressure) is strong, Then the molecules give up a part of the space and are arranged closely (liquid).If the molecules are weak, they make more space and are very closely packed together (solid).If you want to increase the energy of the molecules, you need to heat them, and when the temperature reaches a certain point (boiling point), the molecules can run around and scatter freely (gaseous).

Therefore, the three states of an object are mainly determined by temperature (its own energy) and pressure (external obstacles).

The boiling point is directly proportional to the air pressure. The higher the air pressure, the higher the boiling point; The lower the air pressure, the lower the boiling point.

Reason: When the liquid volatilizes it produces vapor pressure, when the vapor pressure (saturated vapor pressure) is equal to the external pressure, the liquid will boil, and the temperature at this time is the boiling point of the liquid.

When the external pressure increases, the temperature must be raised to make the vapor pressure increase to equal to the external pressure and reach boiling. When the external pressure is reduced, the vapor pressure can be equal to the external pressure when the temperature is relatively low, and the boiling can be achieved.

Proportional should have a formula forgot.

The air pressure is high, and the boiling point is high.

The boiling point of water will change with the change of air pressure, and the boiling point of water will increase as the air pressure increases; When the air pressure decreases, the boiling point of water decreases. The saturated vapor pressure in the bubbles formed inside the liquid as it boils.

The bubble must be equal to the pressure applied to the outside world for the bubble to grow and rise, so the boiling point is the temperature when the saturated vapor pressure of the liquid is equal to the external pressure.

The influencing factors of air pressure:

1. Altitude.

The air pressure decreases as the altitude increases.

2. Distribution of sea and land: Due to the difference in thermal properties between sea and land, the temperature and air pressure between sea and land change with the season. Northern Hemisphere.

In summer, low pressure forms on land and high pressure over the ocean; Winter is the opposite.

3. Air temperature: On the same level, the high temperature is the low air pressure.

On the contrary, the air pressure is high when the temperature is low.

4. Vertical movement of air: the air pressure at the updraft is often slightly lower than that of the same horizontal macro wheel surface; The opposite is true at the downdraft.

1. The boiling point of water is directly proportional to the atmospheric pressure, that is, when the air pressure increases, the boiling point of water also increases, and when the air pressure decreases, the boiling point of water decreases.

2. For pure water, for every 300 meters of altitude, the boiling point temperature will drop by about 1.

Two sets of data: (1) The relationship between the boiling point of water and the pressure: the boiling point of water is 100 when the pressure is 760 mmHg.

When the pressures are *10 mmHg, the boiling points of water are .

2) The relationship between the boiling point and altitude of water: The boiling point of water is 100 when the altitude is 0.

The altitude is -600m, -300m, 3000m, 6000m, 8848m, and the boiling point of water is .

3. In fact, under vacuum, there is no pressure, so as long as water exists in a vacuum, it will immediately resist positive vaporization, theoretically speaking, there is no liquid in the vacuum.

But in real life, there is no such thing as a complete vacuum, so in a vacuum, water vaporizes very quickly, but it does not exist.

The higher the air pressure, the higher the boiling point.

The boiling point is directly proportional to the air pressure, and the higher the air pressure, the higher the boiling point. The lower the air pressure, the lower the boiling point. When the vapor pressure (saturated vapor pressure) is equal to the external pressure, the liquid will boil, and the temperature and hunger at this time is the boiling point of the liquid.

The boiling point of water is 100 under standard atmospheric pressure, the lower the atmospheric pressure, the lower the boiling point, and the higher the atmospheric pressure, the higher the boiling point. The boiling point is directly proportional to the air pressure. The higher the air pressure, the higher the boiling point;

The lower the air pressure, the lower the boiling point. Boiling is a phenomenon of violent vaporization that occurs simultaneously inside and on the surface of a liquid at a certain temperature.

Introduction to barometric pressure

Barometric pressure is the atmospheric pressure acting on a unit area, i.e., the gravitational force exerted on a vertical column of air that extends up to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemispheric experiment proves its existence. Air pressure is the result of the combined action of the molecular motion of the air and the earth's gravitational field.

Barometric pressure is short for atmospheric pressure, which is the atmospheric pressure acting on a unit area, that is, equal to the weight of the vertical column of air that extends upward to the upper boundary of the atmosphere per unit area. The magnitude of the air pressure is related to conditions such as altitude, temperature, etc. Generally, it decreases with increasing height.

In the horizontal direction, the difference in atmospheric pressure causes the flow of air.

The above content is referenced from Encyclopedia - Barometric Pressure.

The degree of boiling point of water.

Usually at standard atmospheric pressure, the boiling point of water is 100 degrees.

The relationship between the boiling point of water and the air pressure.

The boiling point of water can be said to be very correlated with air pressure. Normally we would say that the boiling point of water is 100 degrees, and this is stated under the condition that there is only one standard atmosphere. In fact, the boiling point of water is constantly changing with others.

1. The influence of high and low air pressure on the boiling point: when the air pressure increases, the boiling point of water will also increase, and when the air pressure decreases, the boiling point of water will also decrease. So why is that?

Because the atmospheric pressure on the surface of the water prevents the evaporation of water molecules, once the air pressure rises, it means that water vapor needs to be higher. Similarly, when the air pressure decreases, it is like there is less protective armor on the water, and the water can evaporate and boil at a lower temperature.

2. Example: In some deep mines, the air pressure is usually higher than 1 air pressure, so at this time, boiling water requires a higher temperature, and when the depth reaches 1 km, the temperature of the water should be increased by 2 degrees. But in some places at higher altitudes, such as Mount Everest, the air is thin and the air pressure is very low, so the temperature requirement is lower when boiling water.

Generally speaking, as long as the water is boiled to more than 70 degrees in these places, the water is almost boiling, but this kind of "boiling water" has many disadvantages, it cannot cook the ingredients, and it is difficult to kill some bacteria. So we usually see that in some mines, the workers use pressure cookers to cook food. The pressure cooker is made by using the principle of raising the boiling point under high pressure, and the same is true for household pressure cookers, and the general temperature of household pressure cookers is about 125 degrees.

What is the relationship between air pressure and boiling point.