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# Boyle's Law

## Calculating volume-pressure relationships

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Under Pressure

Credit: Sean Michael Ragan
License: CC BY-NC 3.0

A Syringe [Figure1]

### Boyle's Law

Boyle’s Law states that pressure and volume are inversely related. This can be seen clearly in the video below, where a balloon is placed inside an enclosed area. The pressure of this area can be changed with a vacuum. You can see when the pressure is increased, the volume decreases, and when the pressure is decreased, the volume increases. For this to work, the system must be at a constant temperature.

Start at :33.

Experimenting with a balloon may be interesting, but it doesn’t have much of a practical use. A real world example of Boyle's Law in action is a syringe. In a syringe, when the tube area gets larger, the pressure inside the tube gets smaller. Now that the space outside the syringe has a higher pressure, the blood flows in to compensate.

### Creative Applications

1. What part of the syringe is like the balloon?

2. What part of the syringe is like the pressure changer?

3. Would a syringe work in different temperatures?

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