Hello friends of @steemiteducation, the education of our children is paramount for us as parents and that is why we always have to look for the best teaching tools that help us transmit knowledge in a practical and fun way.

The experiments at home are a very valuable tool that we have to take advantage of, they offer us infinite possibilities that we must use to teach.

Today we will study the process of evacuation by means of an easy but nutritious experiment that will help the children to understand and learn how it works.

 

 

 

Thousands of years ago, man took advantage of the phenomenon of evaporation of water to preserve food and cool drinks. Typical examples of evaporative cooling are sweat, the traditional botijo ​​(boteja, búcaro), the fan, the fan and the canteens lined with felt. In this experiment we will leave everyone speechless because we will use the principles of evaporation to cool drinks without the need for ice or electricity. We will only use a cloth (or kitchen paper) and water. Is it possible?

 

Materials:

 

• A hot day.

 

• A bottles or can full of liquid.

 

• Kitchen paper, cloth, rag or cloth.

 

• Water.

 

• Clothes tweezers.

 

 

Yes now! Let the fun begin, let's go with the experiment!

 

 

 

Procedure:

 

 

• Wet the kitchen paper, cloth or cloth and use it to wrap the bottle or can.

 

 

• If necessary, secure the wrapping with clothespins and leave it in a shady place.

 

 

• Wait two or three hours. Open the wrapper and be surprised at how cool the bottle or can is. Is not it fantastic?

 

 

 

• The cooling by evaporation is very effective to cool watermelons and melons in summer when we usually have the fridge very full. These fruits are delicious but sometimes they are too big.

 

 

It's cool!

 

What has happened?

 

In liquid water the molecules are in constant motion colliding with each other and exchanging energy. As a result of the collisions, some molecules acquire the necessary energy to evaporate, that is, to escape from the water and to pass into the air in a gaseous state.

 

 

Some factors that influence evaporation:

 

• Temperature. If it is hotter, the molecules of the liquid will acquire more energy and will escape more easily from the liquid. That's why the clothes dry before the sun. The exposed surface. The same volume of water will evaporate sooner if it is in a tray than if it is in a glass. The reason is that only molecules that are on the surface can escape from a liquid, those inside can not evaporate.

 

 

 

• .Wind We have not discussed it before, but in the same way that some water molecules gain energy and evaporate, water vapor molecules in the air can also lose energy and move to the liquid state (condensation). The wind takes away the molecules that evaporate. This reduces the likelihood that the water vapor will condense and reach the liquid. The result is that evaporation accelerates. This is how fans and fans work.

 

 

 

 

• Humidity. If the environment is very humid it means that there are many molecules in the form of water vapor. As we have seen in the previous point, these molecules can leave the air, that is to say condensed and pass to the liquid. Evaporation is more difficult the greater the relative humidity of the air, so in humid places it is enough that the temperature is a little high so that we feel a suffocating heat. The sweat does not evaporate fast enough to cool us down.

 

 

In evaporation, water changes from the liquid to the gaseous state. For this, it needs heat, the latent heat of vaporization (energy necessary for a change of state to occur). Where does it come from? Surely you have noticed how fresh the cloth is after a while. From there, the necessary heat must come, from the water that remains in the cloth without evaporating. As the cloth is so cool, the bottle cools down little by little.

 

 

 

Children love to do experiments. With them, while they have fun, they learn and ask questions about the world around them. Among its many benefits, scientific exploration feeds the child's natural curiosity, fosters his interest in science, stimulates reasoning and logic, improves his ability to solve problems, increases his self-esteem and prepares them to understand more complicated scientific concepts in the future. 

To enjoy science is not necessary to have a laboratory, you will be surprised by the amount of experiments that can be done with some home materials. So do not wait any longer, go to work and have fun with your children or students. 

I hope this article has been of interest and help, and I hope that in my next publication.

Posted from my blog with https://wordpress.org/plugins/steempress/

http://lasocia.vornix.blog/2018/11/26/science-at-home-fun-homemade-experiments-for-the-little-ones-lets-learn-about-the-evaporation-process/