When we think of science around, one of the things that pops up in front of us is the fan. Fan is a science contribution to our daily needs. Come on, what is the use of the fan? We all know that when we feel hot, we turn on the fan. But we've never known how fun/chilling we are. Today we will know that. Then think a little. We usually feel cold when the temperature is low.
But does the fan reduce the temperature around us? That makes us feel good or cold? Surprisingly, the fan raises the temperature of the environment very little! Surprised, right? Then it will not work as we thought! Who knew that the whirlwind of this fan will give us so much whirlwind? But in any case, today we will not come up with a solution. To get its solution we need to acquire some knowledge first. Then we will move on to its solution.
We often leave some water in a container or let's say there are a few drops of water left in the glass or mug you drank a while ago. After some time it will be seen that the water has dried up. That's the way it is, isn't it? So how did this water dry up? We know that water evaporates when heated to 100°C. But in this case the water evaporated at room temperature.
The molecules of any liquid are always moving in different directions. Some of these molecules move upwards. Some of the molecules that move faster leave the liquid layer and mix with the air above it. Again, some of the molecules of the liquid moving into the air that is adjacent to this liquid return to the liquid. It goes something like this. Suppose you are playing a game at a friend's house. Sometimes some are going out of the house and some are coming in.
So now if as many people come in as go out then the total number of people in the house will be same. If more goes out, the number of people in the house will decrease. (But what is the probability of more people coming into the house? That is not possible. Because, of those who go out, some come back. So more people than those who go out cannot come in. This would be true if someone from another house moved into your house.)