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Chapter 12: Problem 107

A pressure cooker is a sealed container that allows steam to escape when it exceeds a predetermined pressure. How does this device reduce the time needed for cooking?

Short Answer

Expert verified
A pressure cooker allows steam to reach a higher pressure than atmospheric pressure. This increases the temperature at which water boils within the cooker, leading to faster cooking times due to more efficient heat transfer.

Step by step solution

01

Identify the properties of gas

The gas in consideration here is water vapor or steam which obeys the principles of gases. According to the gas laws, the pressure of a gas is directly proportional to its temperature when volume is kept constant. If the pressure increases, so does the temperature.
02

Understand the working of the pressure cooker

A pressure cooker being a sealed container allows the pressure to increase beyond the atmospheric pressure. This subsequently increases the boiling point of water beyond the usual 100 degrees Celsius at normal atmospheric pressure.
03

Connect high pressure and boiling point to cooking time

Higher temperatures allow faster cooking because heat transfer is more efficient at higher temperature differences. Since in the pressure cooker the water boils at a temperature higher than 100 degrees, the food cooks faster.

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