Barometric pressure is quite interesting knowledge in the geography curriculum that 6th graders get acquainted with. So what is barometric pressure? Why is there pressure? Questions related to barometric pressure? Riclix.vn will continue to help you with the system of knowledge related to this Earth’s natural ingredients!

What is the concept of barometric pressure? What factors affect atmospheric pressure?

Barometric pressure is the force of air on the surface of the Earth. Depending on the condition of the air, there will be different air density and therefore different pressure.

Watching: What is barometric pressure?

On Earth, pressure is distributed according to high pressure belts, low pressure belts are both alternating and symmetrical across the equatorial low pressure. As follows:

At the two poles is the high pressure belt, down to the 60th parallel north and south is the low pressure belt. Continuing down to latitude 30 degrees north and south is the high pressure belt. And the low pressure belt is in the last equatorial region. For ease of visualization, we can observe the following figure:

Distribution of atmospheric belts on earth

Low pressure belts: Located at 60 degrees, 0 degrees and 60 degrees High pressure belts: Located at 90 degrees, 30 degrees, 30 degrees and 90 degrees latitudes.

## Causes of barometric pressure

Air pressure changes with altitude: The higher you go, the thinner the air and the lower the pressure, the lower the pressure decreases. And vice versa, the lower the pressure, the heavier the pressure increases. The pressure changes with temperature: When the temperature decreases, the density increases, leading to an increase in air pressure. And vice versa, when the temperature increases, the density decreases, the pressure is low. The pressure changes with the humidity: When the air contains a lot of water vapor, the air pressure decreases. At the same time, when the temperature is high, the water vapor rises to take the place of the dry air, causing the air pressure to decrease.

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Why is there pressure?

Simply put, barometric pressure is the air pressure that objects are subjected to. Air is a colorless, odorless, tasteless gas that we cannot see or touch. But in fact, humans can feel their existence through the wind generated by the movement of air.

Wind is created by the movement of air to help people feel

Therefore, not only does the air exist, but it also has quality. This quality creates pressure on the Earth and its objects and we call it barometric pressure.

Why is there pressure? Because air has weight. Despite its light weight (1 liter of air weighs 1.3g on average), the atmosphere has a thickness of over 60,000km, so that weight also creates great pressure on the Earth’s surface.

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## Multiple choice questions related to barometric pressure

Here are some multiple choice questions about what barometric knowledge is? Why … helps you confidently do exercises, tests, exams….

Question: What is the barometric pressure at a point? Answer: The barometric pressure of a vertical column of air with a cross section of 1cm2 and a height equal to the thickness of the atmosphere is chosen as the barometric pressure at a point.

Question: The concept of standard mean barometric pressure: Answer: Standard mean barometric pressure is the pressure at sea level equal to the weight of a column of mercury with a cross section of 1cm2 and a height of 760mm.

Question: What is a barometric instrument? What is the unit of barometric measurement? Answer: The barometric instrument is a barometer. There are two units of barometric pressure: millimeters of mercury (mmHg) and Bar (1 bar = 1,000 millibars).

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Question: High pressure belts are distributed in high latitudes, low pressure belts are distributed in low latitudes. True or false Answer: False. Because the high pressure belts are distributed discontinuously, alternately and symmetrically through the low pressure area.

Question: At night, is the sea with higher pressure than the adjacent land true or false? Answer: False

So, do you understand what barometric pressure is? Why is there pressure, right? Don’t forget, if you have any questions or issues that you don’t understand, please leave a comment for everyone to help answer!