Question

Why there is low pressure on the equator?

Answer 1

The amount of solar radiation arriving at the earth's surface and in the atmosphere is much greater at the equator than it is at the poles.

This difference drives a temperature difference, which in turn drives convection cells in the earth's atmosphere, because hotter air expands, becomes less dense and then rises, while colder air contracts, becomes more dense, and then falls.

Heat must flow naturally from the hotter equator to the colder poles, and convection is a major means by which this occurs in the atmosphere.

Continually heated and rising air forms large low pressure areas near the surface. This happens consistently in latitudes near to the equator due to the high surface temperatures. 

Answer 2

Explanation:

To understand the reason why there is low pressure on the equator, we need to study these following factors -

• Gradient force pressure - due to the difference in "atmospheric pressure" (strong where the stratospheres are close and weak where they diverge)
• Frictional force - affects speed and is up to 1-3 km maximum on the ground; At least from the sea.
• Coriolis force - the apparent force discovered in 1844 - is the wind is diverted from right to the northern hemisphere and from left to southern hemisphere. The downward tilt is greater when the speed is higher. It is also in line with the angle of latitude - maximum at the pole and absents at the equator.

At the equator, the "Coriolis force is zero" and winds perpendicular to the stratosphere. The low pressure fills rather than intensifies and hence tropical cyclones do not form near the equator.

This is the reason, there is low pressure on the equator.