As the vertical height from mean sea level increases, the atmospheric pressure decreases.
A.True
B.False

Hint: The atmospheric pressure is the pressure within the atmosphere of the Earth. Simply, it is the layer of the air around the Earth and also, it is thin compared to the size of the Earth and becomes less dense with the increase in altitude

Complete step by step answer:
The three main factors which affect the atmospheric pressures are –
Temperature
The altitude or the elevation
Moisture or the Water vapour
With the increase in the vertical height, the atmospheric pressure falls; this results in the fall in temperature too. By the property, the pressure is directly proportional to the temperature and vice versa.
At higher elevations or the altitudes, the number of air molecules decreases and as a result there are fewer air molecules above a given surface than a similar surface at lower levels. Also, the amount of air is less above the surface and as a result the weight of the air decreases. The atmospheric pressure decreases with the increase in altitude.
The given statement - As the vertical height from mean sea level increases, the atmospheric pressure decreases is true.

Note:
The atmospheric pressure is measured by an instrument called a barometer. One atmosphere is $1013$ millibars, or $760$ millimetres of the mercury.
If the atmospheric pressure is very low, human beings cannot take in the oxygen quickly and breadth properly to meet their body needs.