international angstrom

international angstrom

[¦in·tər¦nash·ən·əl ′aŋg·strəm]
(physics)
A unit of length, equal to 1/6438.4696 of the wavelength of the red cadmium line in dry air at standard atmospheric pressure, at a temperature of 15°C containing 0.03% by volume of carbon dioxide; equal to 1.0000002 angstroms. Abbreviated IA.
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The definition of angstrom sets the scene: Either of two units of wavelength: a: one ten-billionth of a meter--called also absolute angstrom b: the wavelength of the red spectrum line of cadmium divided by 6438.4696--called also international angstrom

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