What does freeze drying have in common with evaporation?

Question

What does freeze drying have in common with evaporation?

Answer 1

Freeze drying uses sublimation to remove moisture from a substance (usually food).  Evaporation in normal atmospheric conditions wouldn't remove enough moisture to preserve food; freeze drying greatly increases the amount of moisture removed to allow perishable items to be stored at room temperature.  This is accomplished by freezing the substance and then reducing the pressure around the substance while carefully adding heat.  This causes the H20 in the substance to sublimate (sublime?), meaning it goes directly from being frozen (solid) to a vapor (gas); evaporation refers to the shift from liquid to gas.

Answer 2

Nothing whatsoever.

It relies on a totally different phase transition (sublimation).

Evaporation would totally defeat the entire object of freeze drying.

Answer 3

In freeze drying water vapor is given off in a vacuum.  In regular evaporation, water vapor is given off from the liquid form.

Answer 4

The removal of moisture. Drying process.

Answer 5

Sublimation (solid to gas) occurs with freeze drying.  In common with this, evaporation also produces a gas.