Thermodynamics part 2: Ideal gas law | Thermodynamics | Physics | Khan Academy

TL;DR

When pressure is increased or volume is decreased, the pressure within a container increases. Similarly, when temperature increases, both pressure and volume also increase.

Transcript

Welcome back. In the last video, I told you that pressure times volume is a constant. That if you increase the pressure-- or if you increase the volume, you're going to decrease the pressure. Hopefully, you got an intuitive sense why. Or likewise, if you squeezed the balloon, or the box, and there are no openings there, then the pressure within the... Read More

Key Insights

• 🔇 Pressure and volume have an inverse relationship in a container.
• 🥺 When a container is compressed, the pressure inside increases, while an expansion of the container leads to a decrease in pressure.

Questions & Answers

Q: How does pressure change when volume decreases?

When volume decreases, the pressure inside a container increases. This is because the same amount of gas molecules is confined in a smaller space, leading to more collisions with the container walls.

Q: What happens to the pressure when a container is compressed?

When a container is compressed, the pressure inside increases. This is because the volume decreases, causing the same number of gas molecules to occupy a smaller space and collide with the container walls more frequently.

Q: How does temperature affect pressure?

An increase in temperature leads to an increase in pressure. This is because an increase in temperature causes gas molecules to move faster, resulting in more frequent collisions with the container walls and thus higher pressure.

Q: How does temperature affect volume?

When temperature increases, the volume of a gas expands. This is because an increase in temperature causes gas molecules to move more vigorously, leading to a greater separation between the molecules and an expansion of the gas.

Summary & Key Takeaways

• Pressure is inversely related to volume, meaning that when volume decreases, pressure increases.

• When a container is compressed, the pressure inside increases.

• Temperature affects pressure and volume, with an increase in temperature leading to an increase in both.