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Chapter 11: Problem 47

How does a pressure cooker work?

Short Answer

Expert verified
A pressure cooker works by trapping the steam from the heated food in a sealed pot, which increases the pressure that in turn raises the boiling point of water, accelerating the cooking process. The pressure is controlled by a valve that releases steam when a set level is exceeded.

Step by step solution

01

Understanding the Structure

Firstly, recognize the structure of the pressure cooker. It is a pot with a sealable lid that is equipped with a pressure release valve. The lid is designed such that it seals tightly to the pot, so no air or steam can escape except through the release valve.
02

The Role of Heat

Next, understand the role of heat. When the food inside the cooker is heated, it releases steam. Because the cooker is sealed, the steam cannot escape, leading to an increase in the pressure inside the cooker.
03

Impact on Boiling Point

The pressure increase also raises the boiling point of water inside the cooker, above the normal 100 degrees Celsius. This means that the food cooks at a higher temperature, reducing the cooking time.
04

Role of the Pressure Release Valve

Finally, understand the role of the pressure release valve. When the pressure inside the cooker exceeds a certain level, the valve opens to release some steam and thereby control the pressure inside the cooker. This prevents the pressure from increasing indefinitely and causing an accident.

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