Glossary F
Freon --->chlorofluorocarbons
Deutsch: Frequenz / Español: Frecuencia / Português: Frequência / Français: Fréquence / Italiano: Frequenza /
The Frequency is the rate at which a periodic event occurs. In electricity it is the rate at which current reverses direction in an alternating current system. In the US and some other countries, alternating current systems use a frequency of 60 cycles per second (60 Hz); in Europe and remaining countries, the standard is 50 Hz.
Frequency Distribution (statistical) is the graphical representation of the dispersion of the different values of a variable that shows their observed occurrence.
Deutsch: Süßwasser / Español: Agua dulce / Português: Agua doce/ Français: Eau douce / Italiano: Acqua dolce
A freshwater is water that contains less than 1,000 milligrams per liter (mg/L) of dissolved solids; generally, more than 500 mg/L of Dissolved Solids is undesirable for drinking and many industrial uses.