What is the purpose of warm up? What does it mean to warm up

It depends on what test you do, and if you need to test time, then you need to.

If it is only a reaction synthesis, it is not needed, because the temperature is just a catalytic process, reducing the activation energy of its molecule, which is just easy to react, and the temperature is different, but it only affects the reaction rate of each stage. The purpose, of course, is to make it evenly heated.

In general, test tubes and crucibles are preheated. Its purpose is to make the heated object evenly heated and prevent the liquid from boiling.

Prevent glass instruments from bursting.

Preheating means: rock skillPre-heated to the specified coarse pre-key temperature.

Preheating refers to preheating the material before welding to prevent rapid heating.

Such as the heating of a flame) now also refers to the preparation for a certain thing when you are preparing to do it.

Preheating when chemically heating liquids: When heating with a test tube, in order to heat it evenly, it is necessary to move left and right on the alcohol lamp first, (if the test tube is fixed, then move the alcohol lamp left and right) and then it can be heated with an external flame fixedly, otherwise the test tube will burst. In addition, beakers and other heating containers with asbestos nets do not need to be preheated.

Preheat, pre-heat to the specified temperature. Preheating refers to the preheating of the material before welding in order to prevent rapid heat penetration. (such as the heating of a flame) now also refers to the preparation of a certain period of hunger to do the same thing, for which to be prepared for rotten reputation.

For the first time, do not pour boiling water directly, but use it first.

The water at 60 or 70 degrees will heat up first, so that the cup body has an adaptation period. It also leads to the need to have a section of preparation for what we do.

1. Preheating, preheating to the specified temperature. Preheating refers to preheating the material before welding to prevent rapid heating. (e.g., heating of a flame) now also refers to preparing for something to be done and to be prepared for it.

2. Preheating when chemically heating liquids: When heating with a test tube, in order to make it evenly heated, you must first move the Zena left and right on the alcohol lamp (if the test tube is fixed, then move the alcohol lamp left and right) and then it can be fixed with external flame heating, otherwise the test tube will explode and crack. In addition, beakers and other heating containers with asbestos netting do not need to be preheated.

Preheating means: preheating. Pronunciation: yù rè.

Analysis: Preheating is a verb that indicates that some preparatory work or preparatory activities are done before the official start to make things or systems reach a suitable state or temperature.

Preheating is commonly found in cooking, sports, ** and other fields. In cooking, preheating usually refers to heating the oven, pan, wok and so on for a period of time before starting cooking to bring them to the right temperature to ensure that the food can be heated evenly or the cooking time can be controlled.

In ** playing, warm-up refers to some practice or rehearsal before the formal performance to get used to the playing state or to warm up the instrument. In addition to these areas, warm-up can also be used in other contexts, such as preparing for a small discussion before a meeting to familiarize yourself with the topic or to activate the mind with hail resistance; Or prepare for a complex operation or task.

Pre-wanton Hu hot sentences1. Before running, I usually do a period of warm-up activities to prepare my body.

2. The coach recommends a proper warm-up before starting the training.

3. Before doing yoga, I will do some warm-up stretching movements to make my body more flexible.

4. Before the start of the competition, the athletes will conduct a series of warm-up training to improve their competitive state.

5. Before playing the instrument, I will warm up my fingers to maintain the flexibility of my hands.

6. Before class, the teacher will carry out some warm-up activities to stimulate students' interest in learning.

7. Before weight training, I do some lightweight movements that warm up to activate my muscles.

8. Before going out in winter, I will warm up for a period of time to get used to the cold temperatures.

That is, preheat.