What is atmospheric pressure?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Atmospheric Pressure**: Atmospheric pressure is defined as the force exerted by the weight of air molecules above a surface. It is the pressure exerted by the atmosphere on all objects within it.

2. **Understanding the Concept**: The atmosphere is made up of layers of air that surround the Earth. The weight of these air layers creates pressure. This pressure is exerted in all directions, including downward towards the Earth's surface.

3. **Example to Illustrate Atmospheric Pressure**: To understand atmospheric pressure better, consider a simple experiment:
- Take a glass filled with water and cover it with a plate.
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