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Physics / University Physics 13 / Chapter 18 / Problem 7DQ

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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“Freeze-drying” food involves the same process as “freezer

Chapter 18, Problem 7DQ

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QUESTION:

“Freeze-drying” food involves the same process as “freezer burn,” referred to in Discussion Question For freeze-drying, the food is usually frozen first, and then placed in a vacuum chamber and irradiated with infrared radiation. What is the purpose of the vacuum? The radiation? What advantages might freeze-drying have in comparison to ordinary drying? Question: Unwrapped food placed in a freezer experiences dehydration, known as “freezer burn” Why?

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QUESTION:

“Freeze-drying” food involves the same process as “freezer burn,” referred to in Discussion Question For freeze-drying, the food is usually frozen first, and then placed in a vacuum chamber and irradiated with infrared radiation. What is the purpose of the vacuum? The radiation? What advantages might freeze-drying have in comparison to ordinary drying? Question: Unwrapped food placed in a freezer experiences dehydration, known as “freezer burn” Why?

ANSWER:

Solution 7DQ The purpose of vacuum in freeze-drying is to cause sublimation of frozen water in the food from the solid to the gas phase. The radiation is used to dry the food material.

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