Pressão atmosférica - sentindo o peso do ar

Hello, little scientists, I am Professor Bill Tyson and together we are going to know different forms of science. All matter has mass, including air around us. It may not seem like it but we are in a great sea of gases, which are constantly compressing our body.

And this we call atmospheric pressure. Let's imagine the following situation: I have 10 bags of sand, one on top of the other. What is easier to lift the 10 bags or only the 3 bags that are on top?

Of course, the three bags are at the top as they make much less pressure. This works with the air too. The more we climb the less air we have pushing our body, so the less atmospheric pressure.

Imagine a climber climbing a high mountain. The more he climbs the less air he has pressing on his body. But the opposite is true as well, the lower we get the higher the atmospheric pressure.

Normally, sea level regions are places where there is greater atmospheric pressure. Being thus on the beach is where there is more air pressing on our body. The atmospheric pressure can also vary according to the temperature, because as we have already seen, the higher the temperature the more distant the molecules are.

It is easy to notice the effects of atmospheric pressure on our body, for an uncomfortable feeling in the ear. Especially when we leave a high region (from low atmospheric pressure) to a low region (high atmospheric pressure). Our ear has a membrane called the eardrum, it is very sensitive and when the internal pressure of our body is different from the external pressure, it can generate discomfort.

But calm, yawning or even chewing gum can help alleviate discomfort and balance the internal pressure. For now, it's just personal, see you next time. How about making science education reach out to more kids?

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