Please fill out the practice report What factors are related to the speed of water vapor .

To put it simply: it is related to the speed of air flow [take two drops of water of the same mass and size, put them on two identical small glass plates, put one of the glass plates in a place with air circulation, such as a balcony, and the other glass plate in an unventilated place, such as a secret room. It will be found that water droplets placed on a glass plate with air circulation are evaporating faster, while water droplets on a glass plate that is not ventilated are evaporating slowly.

It is related to the temperature of the environment [take two drops of water with the same mass and size, put them on two identical small glass plates, and put one of the glass plates in a place with a high temperature and the other at a low temperature. (The greater the temperature difference between the two places, the better). You will find that it evaporates quickly when placed in a place with a high temperature and evaporates slowly when placed in a place with a low temperature.

Related to the size of the surface area in contact [take two droplets of the same mass but different sizes, place them on two identical small glass plates, and put them both in the same environment at the same time. (It is best to keep them in a ventilated place). It will be found that the water droplet with a large surface area evaporates quickly, while the water droplet with a small surface area evaporates slowly

Specifically, these three are there, I hope they will help you.

Is it how fast the water evaporates?

1. The temperature is one high and one low, the high is fast, the temperature is high, and the evaporation is fast.

2. Surface area One opening, one thin opening The larger the surface area, the faster the evaporation.

3. Air flow speed One is placed under the electric fan, and the other is not discharged The surface air flow speed is fast and the evaporation is fast.

When water evaporates, it turns from a liquid to a gas (water vapor), which is very common in our practical life. Drying grains, clothes, etc., are placed in a sunny and ventilated place, and spread out ().The reason is that the speed of liquid evaporation is related to the temperature of the liquid, the surface area, and the flow of air above the surface of the liquid.

The higher the temperature of the liquid, the greater the surface area, and the faster the air flows above the surface of the liquid, the faster the liquid evaporates. Otherwise, the other way around. Factors influencing the speed of water evaporation are carried out experimentally.

Objective: Factors affecting the speed of water evaporation.

**Procedure: 1. Ask a question:

What factors are related to the speed of water evaporation?

2. Hypothetical conjectures:

a. It is related to the temperature of the liquid;

b. It is related to the surface area of the liquid;

c. It is related to the air velocity above the liquid surface.

3. Design experiments:

Equipment: electric hair dryer, 2 pieces of glass, rubber tip dropper, beaker with water, stand, clock.

Steps: a. Drop a drop of water on each of the glass and the glass sheet, and the water on one of the glass pieces is scattered, and observe which piece of glass dries the water quickly;

b. Drop a drop of water on each piece of glass, put a piece of glass in Huizhen on the bracket, and heat it under it with an electric hair dryer to observe which piece of water on the glass piece dries quickly;

c. Drop a drop of water on each glass sheet, one of the glass pieces is placed on the bracket, and heated under it with an electric hair dryer, and the other is heated above it with an electric hair dryer, and observe which piece of glass is dry quickly with the coarse water in the front shed;

4. Analysis and argumentation

Compare the experiments and draw conclusions.

In experiment A, the water on the glass sheet that was scattered dried;

In experiment b, the water on the glass sheet heated by an electric hair dryer dried quickly;

In the C experiment, the water dries quickly on the glass sheet heated above the glass sheet with an electric hair dryer.

5. Draw an introduction:

The higher the temperature of the liquid, the greater the surface area, and the faster the air flows above the surface of the liquid, the faster the liquid evaporates.

6. Life application:

In order to speed up the evaporation of the liquid, it is necessary to increase the temperature of the liquid, increase the surface area of the liquid, and speed up the air flow above the surface of the liquid.

Such as: drying items, etc.

To slow down the evaporation of a liquid, it is necessary to lower the temperature of the liquid, reduce the surface area of the liquid, and slow down the flow of air above the surface of the liquid.

Such as: drip irrigation, pipeline water transportation, the use of plastic wrap to wrap food, etc.