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Under reduced pressure, under carefully controlled conditions, ice sublimes - it goes straight from ice to vapour - no liquid water. It is very useful for drying almost anything, but especially for anything that would be damaged by heating or boiling the water off. That is vacuum freeze drying - the name is often used without the "vacuum" included.
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Why vaccume is given during loss on drying?
Becouse in some of the substance cantain high boiling point solvent, which is not dry easily ,but when we applied vaccume during the drying in oven which decrese the boiling point and increase the rate of evaporation.
Is freeze drying a physical change or chemical?
Freeze-drying is a chemical change because it changes the actual composition of the object by removing water.
Is freeze drying physical change or chemical?
Answer: It is a chemical change, it changes the actual composition of the object by removing water.
How does freeze drying clothes work?
Freeze drying uses sublimation to remove water, water istransformed from solid to gas without the solution state. This prevents damage to colours and can remove water from deep in a structure. But its expensive, and I wouldn't recommend running a vacuum at the levels required. If its a cheap system your probably only evaporating drying - reducing the vapour pressure around the clothes so they dry fast. In the winter if you live in a place that freezes overnight you can do this, my grandparents used to have to freeze dry their clothes in the winter and it worked fine. It is not expensive it if it free, but only in the winter. So if you live in a cold place during winter, get yourself a clothes line and you can freeze dry your clothes.
What two changes of state take place during distillation?
The two changes of state involved in freeze drying are melting and freezing.
Why vaccume is given during loss on drying?
Becouse in some of the substance cantain high boiling point solvent, which is not dry easily ,but when we applied vaccume during the drying in oven which decrese the boiling point and increase the rate of evaporation.
What is lyphilization?
freeze-drying
What two of state are involved in freeze drying?
The two changes of state involved in freeze drying are melting and freezing.
What are two changes of states are involved in freeze-drying?
The two changes of state involved in freeze drying are melting and freezing.
Is freeze drying a physical change or chemical?
Freeze-drying is a chemical change because it changes the actual composition of the object by removing water.
Why During pasta manufacturing there are white spots in pasta?
due to vaccume process drying if it is rapid at first dryer used flour
What are freeze dryers used for?
Freeze drying is a method of dehydrating a perishable product to enable long term storage or easier transportation. One well known application is freeze drying coffee.
What is the difference between lyophilization and freeze drying?
4
Is freeze-drying a chemical or physical change?
yes
Can water evaperate in a freezer?
Yes. It is called freeze drying.
What does AFD mean in food terms?
Accelerated Freeze Drying
Why do you think campers and soldiers use freeze-drying?
Because they are light.
