Food used for hiking and camping is frequently labeled "freeze-dried." Which of the

[Karl]

Food used for hiking and camping is frequently labeled "freeze-dried." Which of the

following term.....? Food used for hiking and camping is frequently labeled "freeze-dried." Which of the following terms best describes the process used to prepare these items?

A) freezing
B) sublimation
C) condensation
D) melting

 

[SteveO1]

B) sublimation


a vacuum removes the water vapor from the solid frozen food

H2O frozen solid --> vaporize
is sublimation


http://en.wikipedia.org/wiki/Freeze_dried
Freeze-drying works by freezing the material and then reducing the surrounding pressure to allow the frozen water in the material to sublimate directly from the solid phase to the gas phase."