| 单词 |
katharometer |
| 释义 |
katharometer|kæθəˈrɒmɪtə(r)|
[f. Gr. καθαρός pure: see -meter.]
An instrument for determining the concentration of one gas in another by comparing the rate of heat loss of an electrically heated wire in the mixture with that in the second gas alone.
1917G. A. Shakespear in Rep. & Mem. Advisory Comm. Aeronaut. No. 317. 3 The following is a brief account of a permeability tester..designed for the rapid testing of balloon and airship fabrics... At the centre of the lower part a katharometer (an instrument for measuring directly the percentage of hydrogen in the air) is fixed. 1945G. R. Noakes Text-bk. Heat ix. 354 The conductivity of hydrogen is about seven times as great as that of air under similar conditions, and this has been made the basis of an instrument called the ‘katharometer’ (or purity tester) originally designed by Shakespear and Daynes for detecting the leakage of hydrogen through balloon fabrics. 1961Engineering 2 June 780/1 One [detector] widely adopted is the katharometer which measures thermal conductivity... It has a zero or constant response so long as carrier gas alone is flowing, but produces a signal each time one of the components emerges from the column. 1971D. W. Grant Gas-Liquid Chromatogr. vi. 116 The katharometer is normally situated in a separately heated air oven, next to the column oven. |
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