different between colorimetry vs colorimeter

English

color +? -metry

colorimetry (countable and uncountable, plural colorimetries)

The science of measuring colours and assigning them numeric values.
(analytical chemistry) Analysis involving the quantitative measurement of colour.

From color +? -meter. Compare Latin color, col?ris.

colorimeter (plural colorimeters)

Any of various instruments designed to determine the color of something, by comparison with standard colors or by spectroscopy.
- 2002, Victoria Finlay, Colour, Sceptre 2003, p. 113:
  It was, however, the need to distinguish specifically between different brown colours which led to the world's first colorimeter.
(analytical chemistry) An analytic instrument that estimates the concentration of a substance in a sample by measuring its color against the solution's complementary color.

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