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Answer for the clue "United States chemist who studied surface chemistry and developed the gas-filled tungsten lamp and worked on high temperature electrical discharges (1881-1957) ", 8 letters:
langmuir

Word definitions for langmuir in dictionaries

Wikipedia Word definitions in Wikipedia
The langmuir (symbol: L ) is a unit of exposure (or dosage) to a surface ( e.g. of a crystal ) and is used in ultra-high vacuum (UHV) surface physics to study the adsorption of gases . It is a practical unit, and is not dimensionally homogeneous , and so ...