61. The liquid employed in kata thermometer.
62. 1 mm Hg difference for every . . . . . . . . m vertical difference.
63. The gas which is produced by when coal containing sulphur is heated out of contact with air to a temperature of about
64. Critical temperature of oxygen.
65. In deep mines 1000 - 1500 m deep the air pressure is about . . . . . . . .% more than at surface.
66. Flame safety lamp light diminishes increasing 5% of black damp, light diminished by . . . . . . . .
67. The effect of breathing air containing CO in air is 0.2%.
68. The methane find in the working in following ways.
69. The weight of AFD . . . . . . . . without battery.
70. Which is formed in stagnent water in old workings in the area of goaf.
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