What is water bath heating and what is the specific method to talk about it in layman s terms

Because the condition for water to reach the boiling point is 100 degrees, but it also needs to absorb higher heat from liquid to gaseous state, in the water bath method, the water in the beaker can only have a temperature of 100 degrees before it becomes water vapor, which cannot provide more heat for the water in the test tube, so the liquid in the test tube cannot boil. Therefore, the principle that the temperature does not change is often used to heat some reactions that need to be heated at a constant temperature in a water bath. Add water to a large container first, then place the container you want to heat into the container to which the water is added.

The purpose of heating is achieved by heating the water in the large container and then transferring the heat to the container that needs to be heated through the water.

The advantage is that the heating is uniform, and it does not lead to overboiling in some tests.

It is to put things in a test tube, then put the test tube in a beaker with water, and then heat the beaker to heat the test tube indirectly, so as to avoid too high a temperature or uneven heating.

1. Water bath heating means: first add water to a large container, and then put the container to be heated into the container to which the water is added. The purpose of heating is achieved by heating the water in the large container and then transferring heat (heat transfer) through the water to the container that needs to be heated.

2. The function of water bath heating is to avoid the excessive intensity and uncontrollability of temperature caused by direct heating, and can be heated smoothly. Disadvantages of water bath heating: because the boiling point of water is 100 degrees Celsius at a standard quasi-atmospheric pressure, vaporization and heat absorption at 100 degrees Celsius, when the object reaches 100 degrees Celsius, there is no temperature difference with water, and heat transfer can not be made, so the object can not continue to absorb heat and heat up, can only maintain 100 degrees Celsius, if the object is to be raised to more than 100 degrees Celsius, the water can be changed to an asbestos net, so that the object can be raised to more than 100 degrees Celsius.

It heats the object evenly, slows down the melting process, and is easy to observe. In some tests, it does not lead to boiling, because the flame temperature of the alcohol lamp is as high as several hundred degrees Celsius, and if the substance is heated directly by the fire of the alcohol lamp, the melting process of the substance cannot be recorded and observed. The water-soluble law will not.

In the water bath method, the water in the beaker can only have a temperature of 100 degrees Celsius before it turns into water vapor, which cannot provide more heat to the water in the test tube, so the liquid in the test tube cannot be boiled.

The advantage of water bath heating is that it avoids excessive intensity caused by direct heating and uncontrollable temperature, and can be heated smoothly. Water bath heating is a heating method that uses water as a heat transfer medium in the chemical laboratory, and the boiling point of the water is 100, and the method is suitable for heating temperatures below 100.

Since the water temperature is at a maximum of 100°C at standard atmospheric pressure, the maximum temperature of the water bath is 100°C. The method of applying the container product in front of the water bath is as follows: the container that needs to be bathed is immersed in a larger container containing water, and the container that needs to be bathed should not be in direct contact with the larger container, and then the larger container is placed on the heat source to heat, and the heating is stopped when it reaches the appropriate temperature, and the water bath container can be taken out after cooling.

The disadvantages of the water bath method: because the boiling point of water is 100 degrees Celsius at a standard atmospheric pressure, vaporization and heat absorption at 100 degrees Celsius, when the object reaches 100 degrees Celsius, there is a temperature difference with the water and the water is not waxing, and the heat can not be transferred, so the object can not continue to absorb heat and heat up, and can only maintain 100 degrees Celsius.

If you want to raise an object above 100 degrees Celsius, you can change the water to an asbestos net to raise the object above 100 degrees Celsius.

The substance to be heated is placed in water, and the effect of heating the substance is achieved by heating the water. Generally, the substance to be reacted is placed in a test tube, and then the test tube is placed in a beaker filled with water, and a thermometer is inserted in the beaker to control the reaction temperature.

The advantage of water bath heating is that it avoids the excessive intensity caused by direct heating and the uncontrollable temperature, and can be heated smoothly, and many reactions require strict temperature control, so water bath heating is required.

The disadvantage of water bath heating is that the heating temperature can only reach a maximum of 100 degrees.

The advantage is that the object is heated evenly, slowing down the melting process and making it easy to observe. In some tests, it does not cause boiling. Because the flame temperature of the alcohol lamp is several hundred degrees Celsius, it is impossible to record and observe the melting process of the substance if the flame of the alcohol lamp is directly heated by the fire of the alcohol lamp in the experiment.

The water bath rule will not. It can also allow the precipitate to be further dissolved.

First, the temperature can be controlled in a more appropriate range and heated evenly, and secondly, the advantage of water bath heating is that it avoids the excessive intensity caused by direct heating and the uncontrollable temperature, and can be heated smoothly.

1.Evenly heated.

2.Increase the heating area.

3.Heating up slowly.

The temperature of the heated substance does not exceed 100 degrees.

Open the water inlet valve to let the water enter the cylinder, and when it reaches a certain liquid level, the overflow pipe water outlet ensures that the water in the cylinder has been filled. Then close the inlet valve.

First turn on the power switch, start the water pump, and then turn the "automatic manual" switch to the "automatic" at this time, the "heating operation" indicator light is on, the electric heating pipe starts to heat, when the water temperature in the cylinder reaches the set upper limit temperature, the "heating operation" indicator light is off, the "heating stop" indicator light is on, the electric heating pipe is not heated, at this time, you can heat the low-temperature natural gas.

If after long-term use, the automatic addition of the electronic control device fails, can not work normally, at this time, in order not to affect the work of the carburetor, you can turn the "automatic manual" switch to "manual". Then operate the manual on and off buttons. In this working state, the digital display only shows the temperature in the cylinder, and the temperature in the cylinder must be controlled manually, and the upper limit does not exceed 70, and the lower limit is not less than 30.

At the same time, the automatic plus road must be repaired as soon as possible.

Slowly open the inlet and outlet valves in turn and close the bypass valve.

When the heater is working, it is necessary to observe the change of water level frequently, and replenish it in time when the water level is lower than the lower limit.

When the water bath heater is not in use, slowly open the bypass valve and close the inlet and outlet valves.

Turn off the water pump, turn off the power switch of the water bath heater, open the cylinder release valve, and drain the water in the cylinder.

1. Water bath heating refers to placing the reaction vessel in hot water at a certain temperature (such as the nitrification reaction of benzene needs to be controlled at 55 to 60 degrees Celsius), and using hot water to indirectly heat the reactant liquid in the container.

This type of heating has four characteristics:

1) Heating is uniform.

2) Stable temperature.

3) The temperature is easy to control (add cold water when it is hot, and heat water when it is cold).

4) Heating from the outside to the inside (such as facilitating the formation of silver mirrors on the tube wall) 2. The boiling water bath is a condition of a hot water bath, and its temperature is more stable, which is a constant 100 degrees Celsius. This can be achieved by constantly heating the water bath apparatus.

3. In practical application, in addition to water bath heating, there are different heating or cooling methods such as cold water bath, ice water bath, oil bath heating, salt bath heating, sand bath heating, etc.

Boiling water bath heating is a kind of water bath heating, boiling water bath heating refers to the temperature of water bath heating is controlled at the boiling point of water.