sodium-line reversal temperature measurement

sodium-line reversal temperature measurement

[¦sōd·ē·əm ‚līn ri¦vər·səl ′tem·prə·chər ‚mezh·ər·mənt]
(physics)
A method of measuring the temperature of a gas containing sodium vapor, in which the gas is placed in the path of a radiator of known temperature, and the temperature of the gas or the radiator is adjusted until the sodium D line disappears against the background of light from the radiator.
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