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Air Exerts Pressure

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Last updated date: 21st Feb 2024
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What is Air Pressure?

There are countless small, microscopic air particles all around us all the time. Air can be squeezed to fit in a smaller amount because air molecules have a lot of "unoccupied" area between them. In addition to having mass, air exerts pressure also. While the term "air pressure" can be used to describe the force of air within a closed space, the term "atmospheric pressure" explicitly describes the force of air particles beyond a particular location in the Earth’s environment. In this article, let’s see more about how air exerts pressure with certain examples.


Air Pressure

Air molecules push throughout all directions and the pressure applied is known as air pressure. From the regions with extremely high pressure, air travels from there to areas where there is lower air pressure. The air moves more quickly when the pressure differential is bigger. Mercury can be used in the formula to measure air pressure.


Air pressure 𑁓 Density of mercury × acceleration due to gravity × height of the column of mercury.


Air pressure can be determined utilising atm, mm, Hg, Pa, and other units.


Example of Pressure

Certain example of pressure is listed below:

  • A labour senses the pressure of the weight carried upon his shoulders.

  • When a nail is pressed into a plank of wood, pressure is applied to it.

  • While cutting fruits using a knife, the knife exerts pressure upon the fruits.


Air Exerts Pressure Examples

The quantity of air within the can or bottle decreases when hot water is poured over it because a portion of the can's steam condenses into water. The pressure of the air within the can is lower than the pressure of the air outside. The outcome is that the can is compressed. This is one among the air exerts pressure examples and also the answer for why the shape of the can or a plastic bottle gets disoriented when we pour hot water in a plastic water bottle and close it tightly.


Atmospheric Pressure Examples

The two atmospheric pressure examples are listed below:

  • Sucker Hook - Air within the sucker hook is squeezed out when it is pressed, leaving a low air pressure environment. The hook sticks strongly to the wall due to the increased exterior atmospheric pressure outside.

  • Drinking Straw - The air in the straw is expelled when it is sucked, leaving a low air pressure region. Drinks were forced into the straw as a result of the higher atmospheric pressure acting upon the water’s surface.


What are the Effects of Air Pressure?

There are several effects of air pressure. Air has weight, and because of its mass, it exerts pressure. The motion of winds, which act as a means of moving moisture and heat through one area to another, is caused by variations in air pressure from region to region. Pressures are significant because of how they affect precipitation and temperature. The examples of the effects of air pressure are as follows:

  • Wind is caused by the effect of air pressure

  • Storms arise as a result of the variation in air pressure

  • They also contribute to the formation of the convective form of rainfall.


How is Wind Caused?

The primary cause of the winds is the unequal heating of the earth's crust. Increased heating causes the air to rise, which results in low pressure. As a result, the air at high pressure fills the area of low pressure that causes the wind. The winds change direction at dusk since air cools more quickly over land compared to over sea.


Difference between Air and Wind

The list of air and wind differences is explained in the tabular column.


Air

Wind

The earth's gaseous composition is referred to as air.

The horizontal movement of air caused by the pressure differential between two locations is known as wind.

It contains both the oxygen we inhale and the carbon dioxide we release. In reality, it contains each gas that contributes to the environment.

The unequal heating of the earth's surface via solar radiation results in wind.


Interesting Facts

  • A balloon is inflated by the air inside it, which applies pressure from all sides. 

  • Moving objects experience resistance from the air. This is referred to as air resistance. Because of this, riding a bicycle requires a lot of effort and vigorous pedalling.

  • The term "anemometer" refers to the tool used to monitor wind speed. 

  • Human body contains both air and liquids that create an internal pressure that counteracts the external atmospheric pressure. This keeps our bodies from collapsing from the pressure of the air surrounding us.


Key Features to Remember

  • We refer to the atmosphere as the air bubble that surrounds the world. Air has weight. Human bodies are constantly under pressure from air weight.

  • The air surrounding us exerts pressure. Wind is the movement of air.

  • Air grows as it is heated and shrinks when it is cooled.

  • Wind motions are mostly caused by uneven heating of the soil.

  • Rain is brought by winds bearing water vapour.

  • Cyclones can be caused when there occur any differences between high-speed winds and air pressure.


Conclusion

As a result, it can be concluded that humans have air and liquids inside their body that exert pressure on the external world, cancelling out the air pressure external to us. The gravity of the air surrounding won't cause human bodies to crumble as a result. Air constantly flows from a point of high pressure area to a place of low pressure area, which is one of the most crucial ideas to keep in mind throughout this article. It's common to feel the wind when air is moving from a high-pressure to a low-pressure area.

FAQs on Air Exerts Pressure

1.  What is the tool used to measure atmospheric pressure?

A barometer is the tool utilised to measure atmospheric pressure. An air mattress, a football, and tire's internal pressure cannot be determined using a barometer.

2. Why the air pressure is lower at the peak of a mountain compared to sea level?

The mass of air particles above causes atmospheric pressure to rise as we travel nearer to the Earth.

3. Explain the earth’s crust air particle density

The mass of the air above compresses the air molecules at the Earth's crust, resulting in a larger particle density.