Question

Assertion: Sudden fall of pressure at a place indicates storm.
Reason: Air flows from higher pressure to lower pressure.
A. Both assertion and reason are true, and the reason is the correct explanation of assertion.
B. Both Assertion and Reason are true, but the reason is not the correct explanation of assertion.
C. Assertion is true, but the reason is false.
D. Both assertion and reason are false.

Answer 1

We know that pressure is defined as the amount of force acting per unit area that gases exert on the surface. That pressure is also called atmospheric pressure and air pressure. The barometer measures atmospheric pressure, and air pressure is measured by tire gauge. Both the statements are based on pressure.

Complete step by step answer:
Air pressure depends on the density of the air since warm air is less dense and creates less air pressure; it will rise. Also, cold air is denser and creates greater air pressure. When warm air rises, cold air will often move into replacing it. The greater is the difference between the high pressure and low pressure, the faster the wind blows. Although the wind blows from higher pressure to lower pressure, it does not blow in a straight line. That's because the earth is rotating. In the northern hemisphere, the spin of the earth causes winds to curve to the right and left to the southern hemisphere. That is called the Coriolis Effect. We know that the pressure of air decreases with height because of it the air having lower pressure comes downwards near the surface of the ocean. That caused air to flow inwards towards the centre of the storm at higher pressure around to it.

Therefore, the correct option is (A).

Note: Atmospheric pressure is caused by the gravitational pull and is a function of the mass of the planet, the radius of the surface, and the amount of composition of the gases and their vertical distribution.