Recommended Daily Allowance (RDA or RfD)The estimated amount of a nutrient (or calories) per day considered necessary for the maintenance of good health by the Food and Nutrition Board of the National Research Council/ National Academy of Sciences.
ReductionThe gain of electrons by an Atom or molecule; the loss of oxygen by an element. Opposite of Oxidation.
RegulationsLegal mandates established by governmental or inter-governmental agencies used to control how entities operate or transact.
ResistivityA measure of how strongly a material opposes the flow of electrical current. A low resistivity indicates a material that readily allows the movement of electric charge. The SI unit of electrical resistivity is the ohm meter [Ω m]. Opposite of Conductivity.