Question

what is atmospheric pressure?

Answer 1

Hey there!

Atmospheric pressure refers to a differential, an imaginary column of air at which its weight is measured at a particular point on the earth's surface. This column exerts pressure on the point by throwing a value. This is basically atmospheric pressure. The calculation is executed as follows: The lower the weight of the column, the lower the pressure exerted and vice versa. It will all depend on the amount and concentration of the molecules.

When the air is very cold, the atmosphere is stable, presenting stable atmospheric pressure levels, but when the air changes drastically its temperature can occur abrupt changes of pressure leading to cyclones and hurricanes that disturb the atmosphere. For example, there are currents of hot air that reach a stable atmosphere causing a mixture of temperature, these cause the pressure to decrease creating instability, if this happens at low altitude, on the contrary, to happen at a higher altitude, instability Of the atmosphere will be regulated by processes.

The atmospheric pressure is measured by means of a measuring instrument called a barometer. The average pressure of the earth's atmosphere is 1013.25 hectopascals or millibars at sea level, which is measured at a latitude of 45 °.

The creation of the Barometer is due to the studies of Evangelist Torricelli, The statement of Torricelli says verbatim: "If it happens that the height of living silver is lower at the top of the mountain, than below, it will necessarily be deduced that the gravity and pressure Of the air are the only cause of this suspension of living silver, and not the horror of emptiness, because it is true that there is much more air than the foot of the mountain than at its apex "

Hope it helps you!

Answer 2

pressure exerted on an object by the weight of the air above it is called atmospheric pressure