Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 17 - Think and Explain: 76

Answer

The lid on the pot prevents convection that might otherwise cool the water, which quickens boiling. Once the water is boiling, the lid increases the pressure on the boiling water, which (very slightly) raises the boiling temperature, cooking the food faster. The effect is tiny unless the lid is clamped down (as in a pressure cooker).

Work Step by Step

This is discussed on page 326.
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