Atmospheric Pressure | Force and Pressure | Infinity Learn

TL;DR

Air pressure is the force exerted by the atmosphere on objects on Earth, and it is evenly distributed in all directions.

Transcript

We are surrounded by air from all the directions. This envelope of air around us is what we call atmosphere. Does air also exert pressure on objects on the Earth? In our previous video, we studied that the liquid exerts pressure in all directions. For example, here we have the water in a beaker. Due to gravity this water is pulled down towards the ... Read More

Key Insights

• 👱 Air pressure, caused by the weight of the air above, exerts force on objects on Earth in all directions.
• 😚 The atmosphere is divided into five layers, with increasing pressure as you move closer to the Earth's surface.
• 💨 Pressure acts in the same way in liquids and air, with equal pressure at a particular height above the Earth's surface in all directions.
• 👻 Balancing of forces due to pressure allows the surface to withstand the massive air pressure without collapsing.
• 👱 Air pressure can be demonstrated by simple experiments, such as using a plastic bottle and cardboard paper.
• 👱 The addition or removal of air can change the pressure balance, affecting the force exerted and the behavior of objects.
• 👱 Understanding air pressure is crucial in various fields, including meteorology, physics, and engineering.

Questions & Answers

Q: How does air pressure exert force on objects on Earth?

Air pressure is created by the weight of the air above, and it applies force in all directions, including upwards, downwards, and sideways. This force can push and pull objects on Earth.

Q: Why doesn't the surface collapse under the huge air pressure exerted on it?

The pressure exerted at points above the Earth's surface is equal in all directions. So, while the downward pressure pushes the surface with force, the upward pressure also pushes it with the same force, balancing each other out and preventing collapse.

Q: How can air pressure be demonstrated in a simple experiment?

A simple experiment involves taking a plastic bottle filled with water, placing a cardboard paper on the open end, and then inverting the bottle. The upward air pressure is sufficient to hold the paper in place against the downward push exerted by the water.

Q: What happens when holes are made in the bottle in the above experiment?

When holes are made in the bottle, air from the top starts exerting pressure on the water. The combined pressure of water and air from the top becomes greater than the pressure exerted by air from the bottom, causing a net force in the downward direction and detaching the paper.

Summary & Key Takeaways

• Air pressure is the force exerted by the atmosphere on objects on Earth, similar to how liquid exerts pressure in all directions.

• The pressure exerted by air is called air pressure or atmospheric pressure, and it acts in every direction, not just downward.

• The atmosphere is divided into five layers, with the pressure increasing as you move closer to the surface of the Earth.