Question

what is freezing drying​

Answer 1

Answer:

Freeze drying, also known as lyophilisation or cryodesiccation, is a low temperature dehydration process that involves freezing the product, lowering pressure, then removing the ice by sublimation. This is in contrast to dehydration by most conventional methods that evaporate water using heat.

Answer 2

Answer:

Step-by-step explanation:

• Freeze drying is a water removal process typically used to preserve perishable materials,
• to extend shelf life or make the material more convenient for transport.
• Freeze drying works by freezing the material, then reducing the pressure and adding heat to allow the frozen water in the material to sublimate.

Freeze-drying is a three-step process that begins with freezing.

• Next the food is placed in a vacuum chamber under low heat.
• The frozen water crystals evaporate directly from ice to water vapor in a process called sublimation.
• The food is nitrogen sealed for storage to prevent contamination from water or oxygen.