Atmospheric pressure is known as the pressure exerted by the air at any point in the atmosphere. Although when one refers to this type of pressure, one is talking about the atmospheric pressure that occurs on planet earth, the same question can be extended to other planets and even satellites.
The mean value of the pressure of the Earth's atmosphere is 1013.25 hectopascals or millibars at sea level, which is measured at a latitude of 45 °.
Then, when the air is very cold, what happens with the atmosphere is that it descends and the pressure increases which leads to witnessing a state of stability, giving rise to what is called a thermal anticyclone and if, on the contrary, the air it is very hot and rises, lowering the pressure and causing what is known as instability, forming a cyclone or thermal storm.
But it can also happen that sporadically something happens that does not happen frequently because they have different density and that is that hot air and cold air mix, but when both are on the surface the cold air pushes the hot air up causing the pressure drops and an instability phenomenon appears. And if, on the contrary, the encounter between both airs occurs but in height, they descend in dynamic convergence, generating an increase in pressure and, as a counterpart to the previous case, they cause stability in the atmosphere.
Regarding the origins of the term and the studies and investigations that were carried out on this issue, they date back to antiquity, many wise men wondered, although without the correct elements in their hands, about the subject, however, it only began to spread towards the end of the seventeenth century when the experiment that finally proved it without a doubt could be done.
