What happens to the pressure when climbing to a height of 12 m?

The pressure becomes lower, since it is created only by the overlying layer of the atmosphere. As it rises upwards, atmospheric pressure drops by 1 mm Hg. every 12 meters and the air becomes thinner. Therefore, depending on the height of the terrain above sea level, the average pressure indicators will be different. Altitude also affects temperature changes. The air heated from the surface of the earth rises, where it expands, mixes with cool air at an altitude and gradually cools down (0.6 degrees Celsius per 100 m of altitude).