Spectrometry is a generic name for determining the nature of a substance by quantifying some observable property, such as emitted light, the rate at which ions move through a medium, or backscattering of ions fired at a material, into finely divided bins. Together, the bins form a sort of signature that identifies the composition of a substance.
Spectrography is a type of spectrometry that sorts electromagnetic radiation into a series of bins based on the wavelength of the photons of radiation. When heated, all atoms emits such radiation, not only in the visible part of the spectrum but throughout the spectrum. A spectrograph can be used to identify the atoms and molecules present in an unknown sample, or to determine the composition, distance, and approximate temperature of objects in space
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