Question

what happens to volume and pressure of air when we inhale and exhale air during breathing

Answer 1

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When you play a wind instrument like this bassoon, your music teacher may tell you to “breathe with your diaphragm.” What is your diaphragm, and what does it have to do with breathing? Boyle’s law explains it.

Why It Matters

We can breathe air in and out of our lungs because of Boyle’s law. According to Boyle’s law, if a given amount of gas has a constant temperature, increasing its volume decreases its pressure, and vice-versa.When you inhale, muscles increase the size of your thoracic (chest) cavity and expand your lungs. This increases their volume, so pressure inside the lungs decreases. As a result, outside air rushes into the lungs. That’s because a gas always flows from an area of higher to lower pressure.When you exhale, muscles decrease the size of your chest cavity and squeeze your lungs. This decreases their volume, so pressure inside the lungs increases. As a result, air rushes out of the lungs, flowing from an area of higher to lower pressure.

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