21. 100 vol. of water dissolving at 15°C only . . . . . . . . vol. of nitrogen.
22. The product of motive column and density of air in D.C shaft called
23. Methane absorbs radiation of wave length . . . . . . . .
24. A 760 mm column of mercury is equivalent to . . . . . . . . meters of water column.
25. This is not a safety feature of flame safety lamp
26. The formula for calculating density of air in D.C shaft.
27. The O2 is lighter than air
28. A three digit LCD indicates oxygen concentration within the range of 0 to . . . . . . . .
29. The inclinatin of water gauge is conveniently adjusted to . . . . . . . . as the sine of that angle is . . . . . . . .
30. Air samples and temperature readings should be taken once in . . . . . . . . days.
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