What factors are related to the speed of evaporation of water in primary school winter vacation lear

Eh, speechless, is there any inevitable logical relationship between the speed of learning and the evaporation of living water during the winter vacation of primary school? Forget it, since you say there is, then there is, and the relationship is as follows:1

If the learning tasks in primary school are too heavy, it will inevitably lead to the panic of primary school students, which will indirectly lead to the occurrence of fever symptoms, and then lead to the rise of air temperature, then the evaporation of water in life will be relatively fast. 2.If the vast majority of people are tired of learning, China's higher education will inevitably go downhill, and the lack of higher talents will lead to a decrease in research talents, so that the speed of evaporation of living water will be measured by no one, so.

Well, I'll admit that I don't have the courage to continue making it any longer, so please spare me.

One. Purpose of the experiment.

A controlling factor for how fast or slow the water evaporates.

Two. Experimental Procedure.

1.Ask the question: What factors affect how fast or slow is evaporation?

2.Establish a hypothesis: Suppose that the temperature can affect how quickly water evaporates.

3.Design Scheme:

Materials: Alcohol lamp, two glass slides, two tweezers, glue-tip dropper, beaker with water.

Experimental method: Draw a small amount of water from the beaker with a rubber tip dropper, drop 2-3 drops of water on each of the two glass slides, and clamp them with the tweezers respectively; One of the slides was placed on a burning alcohol lamp to observe how quickly the two slides evaporated.

Precautions: When heating the slide with an alcohol lamp, use an external flame to heat it; Preheat before heating; There should be a certain distance between the two slides.

Three. Draw conclusions.

The higher the temperature, the faster the water evaporates.

The speed of water evaporation is related to the temperature of the water, the partial pressure of the water vapor in the gas above the water surface, the pressure of the gas above the water surface, and the surface area of the water.

The surface area of the water, the temperature of the water, the speed of air flow.

Temperature, volume, room temperature of water.

Determinants of how fast water evaporates:

1. Temperature: The higher the temperature, the faster the water evaporates.

2. Surface area: the larger the surface area, the faster the water evaporates.

3. The air flow speed on the liquid surface: the greater the air flow speed on the liquid surface, the faster the water evaporates.

The amount of water dispersed into the air by evaporation over a certain period of time is usually expressed in millimeters of the thickness of the evaporated water layer, and the amount of water evaporation from the water surface or soil is measured by different evaporators. Generally, the higher the temperature, the lower the humidity, the greater the wind speed, and the lower the air pressure, the greater the evaporation; Conversely, the evaporation will be smaller.

Microscopically, evaporation is the process by which liquid molecules leave the liquid surface. Since the molecules in the liquid are constantly moving irregularly, the magnitude of their average kinetic energy is adapted to the temperature of the liquid itself.

Determinants of how fast water evaporates:

1. Temperature. No matter what the temperature, there are always some molecules in the liquid with a high velocity that can fly out of the liquid surface and become vapor molecules, so the liquid can evaporate at any temperature. If the temperature of the liquid increases, the average kinetic energy of the molecules increases, and the number of molecules flying out of the liquid surface increases, so the higher the temperature of the liquid, the faster it evaporates.

2. Wind speed. Wind speed is the flow of air. When vapor molecules flying into the air collide with air molecules or other vapor molecules, they may be bumped back into the liquid. If the liquid surface air flows quickly and is well ventilated, the less chance the molecules will return to the liquid, the faster the evaporation.

3. Air humidity.

The higher the humidity, the slower the evaporation. For example, "sauna days" mean that the air temperature is large, the evaporation is slow, and people cannot evaporate quickly after sweating, resulting in less heat absorbed from the human body, and people will feel stuffy.

4. The surface area of the liquid.

If the surface area of the liquid increases, the number of molecules near the surface of the liquid increases, so that the number of molecules flying out of the liquid surface increases at the same time, so the liquid surface area increases, and the evaporation accelerates.

The area of water evaporation is fast or slow, and the air flow is related to the ambient temperature.

The control variable method is an important method in the study of physical and biochemical sciences. Since among all the factors that have an impact on matter, we want to study the influence of which factor, then we will make all other factors consistent, and then change the factor we want to **, so as to study the influence of this factor on matter.

Take this question as an example: Xiaohua wants the most variable substance, then what he needs to control is temperature, wind direction, humidity, etc., he chooses to put these three substances in the same place, so it means that in addition to the different types of substances, other factors are consistent? For example, the initial surface area of these liquids, the surrounding temperature, and the speed of air flow, has Xiaohua maintained these factors in the past few days?

And it is precisely that Xiaohua chose the same place, so this keeps these variables consistent, that is, he uses the control variable method. The variables controlled by Xiaohua here are temperature, air circulation, liquid surface area, and so on.

As can be seen from the narrative, Xiaohua came to the conclusion that the speed of evaporation is related to the type of substance.

1.The speed of evaporation may also be related to the type of substance.

2.Practice makes sense.

3.Mass, surface area, location, temperature (the temperature of the same place can be considered the same).

3. The mass is equal and the surface area is equal (obtained from three identical plates).