GEOLOGY

EARTH SCIENCE

CLIMATE AND ENVIRONMENTAL CHANGE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following statements about air pressure is correct.
A
Low pressure is associated with clear skies.
B
Air moves from high pressure to low pressure.
C
When air is cooled it creates low pressure.
D
High pressure is associated with high rainfall.
Explanation: 

Detailed explanation-1: -Detailed Solution. Air pressure is defined as the pressure exerted by the weight of air on the earth’s surface. Air always moves from high pressure to lower pressure, and this movement of air is wind.

Detailed explanation-2: -Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

Detailed explanation-3: -Air exerts pressure in all directions. When air molecules collide with a surface, they exert force. Since, the air particles move randomly in all directions, they exert pressure in all directions.

Detailed explanation-4: -Air always flows from a region of high pressure to a region of low pressure. As hot air being less denser rises up and creates a region of low pressure, air from nearby high-pressure region flow towards the low-pressure region.

Detailed explanation-5: -Air in high pressure systems moves in an anticlockwise direction (in the southern hemisphere), while air in low pressure systems moves in a clockwise direction due to the rotation of the Earth. At the surface of the Earth air flows from high pressure systems into low pressure systems.

There is 1 question to complete.