41. How many tests for gases are made before blasting in gassy mine.
42. The specific gravity of oxygen is
43. The pressure measuring instrument used in certain types of ventilation surveys is
44. 100 vols. of water disolving CO2 at 15°C . . . . . . . . vol. of CO2.
45. When methane burns in air this produces
46. Principle behind the rekins interferometer is
47. The temperature and relative humidity of air increase in the vicinity of a place of . . . . . . . .
48. Automatic fire damp detector operates as the principle of . . . . . . . .
49. The wet kata for light manual workers is
50. The unit bar used by the metrologists to measure the atmospheric pressure is equivalent to
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