| Freon |
Registered trade name for the chlorofluorocarbons (CFCs).
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| frequency distribution |
1. A curve the coordinates of which are the values of the variable and the frequency of occurrence. It is often presented as a histogram. Compare probability distribution. 2. (Also called frequency curve.) The relationship between the probability that a threshold is exceeded and the threshold. In a graphical representation, the curve is often plotted with frequency or probability on the vertical y axis and the corresponding rainfall or flood flow values on the horizontal x axis.
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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
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| free electron |
An electron not bound to an atom or molecule. In this sense a (negative) beta particle is a free electron.
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| free radical |
A chemical species that possesses an unpaired electron. These compounds, such as chlorine monoxide (ClO), hydroxyl radical (OH), and nitric oxide (NO), are characterized by a high chemical reactivity. Free radicals are often generated in the atmosphere from the photodissociation of more stable species. Their subsequent chemistry is central to such environmental issues as stratospheric ozone depletion and tropospheric oxidant production.
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