to flash freez you'll need an industrial freezer.
its basicly dropping the temp to 0 or below 0 in a matter of seconds.
but a look on google show
1. What does flash freezing mean?
When you are doing freezer cooking, you may see recipes that call for you to "flash freeze". However, this term always sounds confusing for beginners... does it mean some secret way of freezing something faster? Does it refer to only freezing something for a specific amount of time? Actually, neither!
Flash freezing refers to the freezing technique where you lay out something individually, usually on a cookie sheet, then once it is frozen, you remove from the cookie sheet and store in something more freezer-space-friendly such as a Ziploc or plastic container.
Things that are often flash frozen include hamburger patties, berries, chicken nuggets or strips and french toast or waffles.
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http://www.momsbudget.com/freezercooking/flashfreezing.html ]
2. Flash freezing
From Wikipedia, the free encyclopedia
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Flash freezing refers to the application of supercooling in various kinds of industries whereby objects are quickly frozen by subjecting them to cryogenic temperatures.
For example, flash freezing is used in the food industry to quickly freeze perishable food items (see frozen food). In this case, water contained inside the food items is subjected to temperatures well below its melting/freezing point (273.15K or 0°C). This causes the water inside the foods to freeze in a very short period of time. See supercooling for the further details of this process.
A supercooled liquid will stay in a liquid state beyond the normal freezing point when it has less opportunity for nucleation, that is if it is pure enough and has a smooth enough container. Once initiated, it will very rapidly change state into a solid.
American inventor Clarence Birdseye developed the quick-freezing process of food preservation in the early 20th century. He is considered the father of the frozen-food industry. His idea was to keep our food from decay and infection, by turning water to ice, making it unavailable for bacterial growth and chemical reactions. Freezing since then has become a major part of life for everyday people and is one of the most commonly used processes commercially and domestically.
[wikipedea]
but freeze drying is completley differnt
http://en.wikipedia.org/wiki/Freeze_drying
http://home.howstuffworks.com/freeze-drying.htm
go read it its interesting too.