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Chapter 17: Problem 14

How does a pressure cooker work?

Short Answer

Expert verified
A pressure cooker works by sealing the pot to create a high-pressure environment, which raises the boiling point of water and cooks food faster at higher temperatures.

Step by step solution

01

Airtight Seal

A pressure cooker works by creating an airtight seal when the lid is locked in place. This prevents any liquid or vapor from escaping, unlike in a regular pot where steam can escape freely.
02

Increase in Pressure

Heat is then applied to the pressure cooker. As the content heats up, it tries to evaporate, but because the steam cannot escape, it builds up and creates a higher pressure inside the cooker. This leads to a rise in the pressure inside the cooker compared to the open atmosphere.
03

Elevation in Boiling Point

Under normal atmospheric pressure, water boils at 100掳C (212掳F). But as the pressure increases, it directly influences the boiling point of water, meaning the temperature at which water turns from liquid to gas. This leads to an increase in the boiling point of water. For example, water in a pressure cooker can reach a temperature higher than 121掳C (250掳F).
04

Fast Cooking

With the increased temperature due to the heightened boiling point, food inside the pressure cooker is cooked at a much higher temperature than possible in a regular pot. This high temperature allows the food to cook faster, often in about 1/3 the time.

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Most popular questions from this chapter

In which gas are the molecules moving faster: hydrogen at \(75 \mathrm{K}\) or sulfur dioxide at \(350 \mathrm{K} ?\)

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