| free energy |
Perpetual motion machines (the Latin term perpetuum mobile is not uncommon) are a class of hypothetical machines which would produce useful energy in a way which would violate the established laws of physics. It is generally accepted that perpetual motion machines cannot exist. In particular, perpetual motion machines would violate either the first or second laws of thermodynamics. ...
출처: en.wikipedia.org/wiki/Free_energy_(perpetual_motio...
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| free association |
A Free Association is an association which meets certain mostly negative criteria. Generally,(1) It does not charge fees for membership.(2) It does not control its members.(3) It does not speak for the members except with their explicit and individual permission.(4) It does not collect unappropriated assets beyond immediate needs.(5) It does not own significant property, except perhaps its name.(6) It does not take positions on issues of controversy among its membership. ...
출처: en.wikipedia.org/wiki/Free_Association
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| freeze-drying |
Freeze drying (also known as Lyophilization) is a dehydration process typically used to preserve a perishable material, or to make the material more convenient for transport. Freeze drying works by freezing the material and then reducing the surrounding pressure to allow the frozen water in the material to sublimate directly from the solid phase to gas. ...
출처: en.wikipedia.org/wiki/Freeze-drying
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| free radical |
A highly reactive chemical that often contains oxygen and is produced when molecules are split to give products that have unpaired electrons (a process called oxidation). Free radicals can damage important cellular molecules such as DNA or lipids or other parts of the cell.
출처: www.stjude.org/glossary
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| freeze |
1. See freezing. 2. The condition that exists when, over a widespread area, the surface temperature of the air remains below freezing (0
출처: amsglossary.allenpress.com/glossary/browse
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