Glossary R

The Environmental Glossary. Letter R +++ Popular Articles: 'Range', 'Recycling', 'Renewable energy'

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

Deutsch: Strahlung / Español: Radiación / Português: Radiação / Français: Rayonnement / Italiano: Radiazione

In physics, radiation is a process in which energetic particles or energetic waves travel through a vacuum, or through matter-containing media that are not required for their propagation. Waves of a mass filled medium itself, such as water waves or sound waves, are usually not considered to be forms of "radiation" in this sense.

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.

Deutsch: Radioaktivität / Español: Radiactividad / Português: Radioatividade / Français: Radioactivitê ©/ Italiano: Radioattività
Radioactive decay, also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting ionizing radiation. A material that spontaneously emits this kind of radiation — which includes the emission of alpha particles, beta particles, gamma rays and conversion electrons — is considered radioactive.

Deutsch: Radioaktiver Zerfall / Español: Decaimiento radiactivo / Português: Decaimento radioativo / Français: Désintégration radioactive / Italiano: Decadimento radioattivo

Radioactive decay (a.k.a nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy by emitting radiation. This phenomenon is a natural part of the disintegration of radioactive isotopes, leading to the transformation of one element into another.

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).

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