Why does sweating cool you down? | NCLEX-RN
Why sweating cools you? This is an excellent question for Baron, And to answer her, let’s do a close-up on a drop of sweat And sweat is mainly water, so when we do close-ups, and we get very close, Even more than I did here.
When we get very close, we’ll start seeing mostly these water molecules.
And water molecules, just to be a bit more accurate, I painted the oxygen in blue, and I painted the oxygen-related hydrogen in white. We all know that sometimes water is treated as H2.
It’s because of the H2O pair. So each of these is H2O molecules or a water molecule. What I’ve painted here, and those molecules of your skin are very simple.
But just for us to have simple, these are your skin molecules.
Really, the parts of the skin cells.
Not even the skin cells themselves, These are the molecules from which skin cells are composed. And right here, these are molecules of sweat, or they are actually simply molecules of water.
So the question, why sweat cools you, can be rephrased as Why water on the surface of the skin, really cool you? And to answer that, or to think about this question, We need to think about what it means to have a temperature, or what it is actually temperature.
Temperature, what we perceive as temperature, is simply the displacement of molecules or something. So high temperature means they move more. Then the higher the temperature they move more, and the lower the temperature they move less.
And they can move in different ways, It may be that they really move from place to place. They can vibrate, they can move around somewhere. And on average, the more traffic there is, which is usually referred to as kinetic energy, Of these molecules have an average, the higher the temperature will be.
Now, how come these waters here cool the skin? Well, first, why does the skin get hot? Because the muscles do a lot of work, they release heat. This heat goes to the skin. But how come this water here helps? Well, the skin has some kind of temperature, some kind of kinetic energy, or traffic energy.
But when you say that, it does not mean that all these molecules have exactly the same movement. This temperature is the average traffic. Some of these moves at a higher rate.
Or vibrate at a higher rate, or rotate at a higher rate And some do it at a slower pace. But when they move, they are going to collide with these water molecules and make them move. They’ll probably move a little earlier, too, But the warmer it is, the more energy there is, the more they collide with these molecules.
So let’s say she crashes here, and then she’ll crash into there, And this energy, this moving energy, or this kinetic energy, Well, part of it will be transferred, or you could say even part of that temperature, Part of this heat will be transferred to these water molecules. But the important thing to remember is that it’s a really crazy thing, they all just collide with each other And wandering around in crazy ways.
They will have average kinetic energy, which we perceive as temperature, But it may move very, very, very fast in that direction, While it may move very, very, very slowly, It may move very, very, very fast in that direction It may move very, very, very slowly in this direction So the thing to think about is, given that there are all these differences in the energy of all these particles, Which one is most likely to escape, actually evaporate? And to think about evaporation, just have to think about that most water molecules Or the water molecules in the droplet They have one attraction to another, we call it hydrogen bonds.
They have one attraction to the other, This is why rinsing stays in shape. But if one of the molecules moves fast enough and if it moves in the right direction She has a high chance of escape, To be able to escape this drop. And the process of these molecules that manage to escape is what we call evaporation.
If the molecule has enough energy, it will escape, releasing itself from the bonds of the other molecules. And just evaporate in the air. But we have not yet fully answered the question.
Let’s say it evaporated, she ran away from the drop. Why is it going to get rid of this entire system? Why would it cool the drop and eventually allow it to absorb more energy from the skin? Well, we’ve already said that those with the highest chance of escape are the ones with the most energy, Those who have the most kinetic energy. So if you have a lot of things, some fast, some slow, some vibrating a lot, less vibrating But those with the highest kinetic energy are most likely to escape, what happens when they run away? Well, the average kinetic energy will drop.
Or you could say the temperature would drop, Which is, simply, the average amount of movement or kinetic energy in a drop. If the fastest, those with a lot of energy, are leaving, then those who stay, on average, will have a lower average kinetic energy or a lower temperature. So this is what defines you at the molecular level.