Glossary R

The Environmental Glossary. Letter R +++ 'Reporting Limit', 'Repeatability', 'Reproducibility'
A R rating curve is a drawn curve showing the relation between gage height and Discharge of a stream at a given gaging station.

The R-value or "thermal resistance value" is a measure of the resistance of a material to Heat flow. The term is typically used to describe the resistance properties

A RADIANT HEAT TRANSFER is RADIANT HEAT TRANSFER occurs when there is a large difference between the

A Radiation: is Radiation is Energy emitted in the form of electromagnetic waves. Radiation has differing characteristics depending upon the wavelength. Because the radiation from the

A Radiative Forcing is a change in the balance between incoming solar radiation and outgoing infrared radiation.

A radioactive waste is the Byproduct of nuclear reactions that gives off (usually harmful) radiation.

A radioactivity is the spontaneous emission of matter or energy from the nucleus of an unstable atom (the emitted matter or energy is usually in the form of alpha or beta particles, gamma rays, or neutrons).

A Radiometer is an instrument for detecting and measuring the intensity of the sun's energy in the electromagnetic spectrum.

A Radionuclide is an unstable form of a Chemical Element that radioactively decays, resulting in the emission of nuclear radiation.

radionuclides are "Versions" of chemical elements that are not stable, or in other words, are susceptible to undergoing radioactive decay.