The working principle of the psychrometer is .

A wet and dry bulb thermometer is composed of two thermometers. Among them, the thermometer exposed to air is called a dry bulb, which measures the ambient temperature of the air, that is, the dry temperature value; The sensor of another thermometer needs to be wrapped in gauze soaked in distilled water, and the lower end of the gauze is immersed in distilled water, called a wet-bulb thermometer, to measure the humidity temperature value. These two thermometers measure the dry temperature value and the humidity temperature value respectively, among which, in the measurement process, the wet temperature value must be lower than the dry temperature value.

Because the moisture in the moistened gauze continuously evaporates into the surrounding air and takes away the heat, the wet-bulb temperature drops. Since the water evaporation rate is related to the water content of the surrounding air, the lower the air humidity, the higher the water evaporation rate, resulting in the lower the wet-bulb temperature. It can be seen that there is a temperature difference between the dry bulb and the wet bulb temperature, and this temperature difference is a certain function of the humidity value, so we can obtain the humidity value by the temperature difference between the dry temperature and the wet temperature.

It should be noted here that the gauze of the wet bulb should be changed frequently, and the hygrometer must be in a ventilated state, that is, the wind speed near the wet bulb must reach the above: only when the gauze water jacket, water quality, and wind speed meet certain requirements, can the specified accuracy be achieved.

The working principle of the wet and dry thermometer is: when the air is dry, the gauze of the wet bulb thermometer evaporates quickly, absorbs more heat, and the difference between the two thermometers is relatively large. The greater the difference between the two thermometers, the drier the air.

When there is a lot of water vapor in the air, the gauze of the wet-bulb thermometer evaporates slowly, absorbs less heat, and the difference between the two thermometers is small. The smaller the difference between the two thermometers, the more humid the air.

In the two thermometers, the dry bubble thermometer glass bubble is exposed to the air, which shows the temperature of the air, that is, the room temperature; The glass bubble of the wet bubble thermometer is wrapped in a wet cloth, because the water in the wet cloth evaporates and absorbs heat, so the indication of the wet bubble thermometer is smaller than that of the dry foam thermometer. And the drier the air on the day, the faster the evaporation, the more heat absorption, and the greater the difference between the two thermometers; On the contrary, when the more water vapor in the air, that is, the greater the humidity, the slower the evaporation, and the smaller the difference between the two thermometers, so the difference between the two thermometers can reflect the content of water vapor in the air.

The working principle of the psychrometer is that the psychrometer consists of two thermometers of the same size, one is called a dry-bulb thermometer, and its temperature bubble is exposed to air to measure the ambient temperature.

The other is called a wet-bulb thermometer, and its warm bubble is wrapped in a special gauze and manages to keep the gauze moist, and the moisture in the gauze constantly evaporates into the surrounding air and takes away the heat, causing the wet-bulb temperature to drop.

Function: There is a device that can reflect the water vapor content in the air called a hygrometer.

How it works:

It is made from two identical thermometers side by side, one of which is wrapped in a damp cloth. The readings of the two thermometers are not the same, and the dry bubble thermometer glass bubble in the two thermometers is exposed to the air, which shows the temperature of the air, that is, the room temperature; The glass bubble of the wet bubble thermometer is wrapped in a damp cloth, because the water in the damp cloth evaporates and absorbs heat.

Therefore, the indication of the wet bubble thermometer is smaller than that of the dry foam thermometer. And the drier the air on the day (i.e., the smaller the relative humidity), the faster the evaporation, the more heat absorption, and the greater the difference between the two thermometers; On the contrary, when there is more water vapor in the air (i.e., the greater the relative humidity), the slower the evaporation, and the smaller the difference between the two thermometers, so the difference between the two thermometers can reflect the relative humidity of the environment.

The wet thermometer has a wet cotton ball bag, because there is water that will evaporate, so its temperature is lower than the dry bulb temperature, and then use the temperature of the dry bulb thermometer to reduce the temperature difference of the humidity bulb thermometer, and then check the relative humidity gauge The greater the difference, the drier the air on the contrary.

Water evaporation absorbs heat, while the humidity of the air (water vapor pressure) affects evaporation. In this way, the temperature of a dry-bulb thermometer can be compared with that of a wet-bulb thermometer.

Principle: The psychrometer is composed of two thermometers of the same specification, one is called the dry bulb thermometer, and its temperature bubble is exposed to the air to measure the ambient temperature;

The working principle of the psychrometer is that the psychrometer consists of two thermometers of the same size, one is called a dry-bulb thermometer, and its temperature bubble is exposed to air to measure the ambient temperature. The other is called a wet-bulb thermometer, and its warm bubble is wrapped in a special gauze and manages to keep the gauze moist, and the moisture in the gauze constantly evaporates into the surrounding air and takes away the heat, causing the wet-bulb temperature to drop. The rate of water evaporation is related to the water content of the surrounding air, and the lower the air humidity, the faster the water evaporation rate, resulting in the lower the wet-bulb temperature. It can be seen that there is a functional relationship between air humidity and the temperature difference between the wet and dry bulbs.

The psychrometer uses this phenomenon to determine air humidity by measuring the dry-bulb temperature and the wet-bulb temperature.

Psychrometer is also called psychrometer. The use of water evaporation is endothermic to cool down, and the speed of evaporation (i.e., how much it cools) is related to the principle of relative humidity of the air at that time. Its structure is to use two thermometers, one of which is wrapped in white gauze at the ball part, and the other end of the gauze is immersed in the water tank, that is, the gauze is constantly kept wet by capillary action, which is the wet bulb.

Another thermometer that is not wrapped in gauze and is exposed to the air is called a dry bulb (dry bulb is the temperature of air temperature).

From the perspective of microstructure, when the temperature of the object increases, the kinetic energy of the molecule increases, and the average free path of the molecule increases, so it is manifested as thermal expansion; In the same way, when the temperature of the object decreases, the kinetic energy of the molecule decreases, and the average free path of the molecule decreases, so it behaves as cold contraction. This is the real reason for thermal expansion and contraction, and it is also how thermometers work.

Wet and dry bulb thermometer is an instrument for measuring air temperature and air humidity.

Wet and dry bulb thermometer is an instrument for measuring air temperature and air humidity. It consists of two identical ordinary thermometers, one is used to determine air temperature, called a dry-bulb thermometer; The other is wrapped in gauze soaked in distilled water at the ball part, and the lower end of the gauze is immersed in distilled water, which is called a wet-bulb thermometer.

According to the measured dry-bulb temperature and wet-bulb temperature, check the "moist air line map", and you can know the temperature, humidity, specific heat, specific enthalpy, specific volume, partial pressure of water vapor, heat, sensible heat, latent heat and other information of the air in this state. For example, when the dry bulb is 18 degrees and the wet bulb is 15 degrees, the longitudinal bar with a difference of 3 degrees and the horizontal bar of the wet bulb 15 degrees cross 68 degrees, which means that the humidity is 68%.

By measuring the measured values, the changes in the state of air heating, cooling, humidification and dehumidification can be calculated against the humidity line graph.

The dry-bulb probe of the wet and dry thermometer is directly exposed to the air, and the wet-bulb temperature probe is wrapped with wet gauze, and the principle of humidity measurement is that under a certain wind speed, the moisture evaporation of the wet gauze outside the wet bulb takes away the heat on the probe of the wet-bulb thermometer, so that its temperature is lower than the temperature of the ambient air; The dry bulb temperature The wet and dry bulb thermometer measures the actual temperature of the ambient air, at this time, the temperature difference between the wet bulb and the dry bulb has a corresponding relationship with the relative humidity of the environment, but the relationship is nonlinear. It's quite complicated to express in a formula. The relationship between the two can be influenced by a number of factors, such as:

Wind speed, accuracy of the thermometer itself, atmospheric pressure, size of the surface area of the bulb of the wet and dry bulb thermometer, gauze material, etc.

Relative humidity = partial pressure of water vapor Saturated vapor pressure (at a constant pressure and temperature).

The wet bubble method is compared to the dry bubble method.

Wet Brew Wet Brew, as the name suggests, is that when brewing, the tea tray can be wet.

When it is wet, put a tea tray on the table that occupies half the size of the tabletop, and place the bowl, fair cup, tea cup, and tea cup on the tea tray.

When the water boils, raise the kettle, and wash the bowl and teacup tea set in the way of hanging pot high, and when rinsing, the water will be directly injected into the tea tray, and then flow into the tea bucket below from the small hole at the bottom of the tea tray, along the rubber tube.

Wet brew, the tea tray is more like a bathing room, the tea soup can be poured directly on the tea tray, wash the tea, pour the tea, you can move a little bigger, the tea juice spills out, don't pay attention to it at all, the sewer system of the tea tray can quickly discharge the water into the lower barrel.

It can be said that wet brewing is a more traditional way of brewing kung fu tea.

Dry foam corresponds to wet foam and is dry foam.

Dry brewing means that in the process of making tea, except for the water in the bowl and the fair cup, all other places are dry.

Whether it is a tea tray or a tabletop, it is required to be dry, and if a drop of tea stain is missed, it must be wiped clean with a tea towel immediately.

The dry brewing method removes the original huge tea tray and leaves room for the tea table.

There is no tea tray that occupies a large area, you can arrange the tea table, arrange it a little more literary, a little more elegant, arrange a flower, raise a calamus or something, and add some leisure and elegance.

This dry brewing method, which was popular from Taiwan, is now prevalent in the homes of major tea drinkers.

Among the readers of Cungu Chen, there are a large number of loyal supporters of the dry brewing method.

The smaller the difference in psychrometer power, the greater the humidity of the air. The principle is that the drier the air at the same temperature, the faster the evaporation rate of water molecules, the lower the water temperature, the lower the degree of the wet bulb, and the decrease of relative humidity, and the higher the degree of wet bulb, the increase of relative humidity. Since the evaporation speed of water molecules is also related to temperature, the relative humidity can only represent the water density of the air at a certain temperature point.

1.Principle: Because one of the thermometers is wrapped in a damp cloth, the moisture evaporates and absorbs the heat, showing that the temperature is lower than the other, and the drier the air, the greater the difference. 2.A small gap means a high humidity in the air.

Jia Xichun into the painting, color screen, color children.