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What is lyophilisation?
Freeze-drying (also known as lyophilization or cryodesiccation) is a dehydration process typically used to preserve a perishable material or make the material more convenient for transport. Freeze-drying works by freezing the material and then reducing the surrounding pressure and adding enough heat to allow the frozen water in the material to sublime directly from the solid phase to gas.
If you freeze lead is it still toxic?
Yes. A material's toxicity does not usually change after a change of state.
How do you dehydrate ice cream like for astronauts?
The process is called freeze drying and can be applied to anything, not just ice cream..Freeze the material.Place it in a vacuum chamber.Pump the air out of the vacuum chamber.Water sublimes from the material into the vacuum.When fully dehydrated let air back into the vacuum chamber.When back at ambient pressure, remove material from vacuum chamber.The advantage of freeze drying over other dehydration methods is it retains shape, color, and texture of the material. The disadvantage is the cost.
Which material has the least melting point?
Helium remains liquid even at absolute zero, so by default it has the lowest melting point. If the material must actually freeze, the material is therefore Hydrogen. BOOMSHEDANGA! (Like my new catchphrase?)
Why don't horses hooves freeze?
Horses hooves don't freeze because they are made of a horny material . Almost like our nails on our fingers and toes . this material doesn't have any nerves so it doesn't register the coldness . Just like when a blacksmith puts shoes on horses ; They don't feel the nails going into their hooves =)
Will five liters of water will freeze at the same temperature as five milliliters of water?
The freezing point is an intensive property, not dependent on the amount of of material.
Are diamonds stronger when frozen?
There is no material contained in diamonds that can freeze. Plus, strong is not a word associated with the mineral diamond: the associated word is hardest.
Can anti freeze freeze?
Yes it can freeze.
Why did the Kwakiutl use cedar bark and animal fur to make clothing?
They would because they would freeze to death if they didn't have a warm fur jacket or blanket.
You can freeze liquid but how do you freeze it?
it will freeze in to a ice block
What future perfect tense of freeze?
the word freeze is already in present tense. i am going to freeze this, it could also be freezing i am freezing Also Verb: to freeze, is freezing Adj: is frozen
Can you freeze unopened can goods?
No. Freezing canned goods will expand the material inside and split the can open. Food is canned to preserve it . . . you could simply store it on the shelf in a cool place.
