81. The length of glass tube in Fortin barometer . . . . . . . . and the inside diameter . . . . . . . .
82. The principle behind the flame safety lamp and spiral alarm detectors . . . . . . . .
83. The effect of breathing air containing CO in air is about 0.12 . . . . . . . .
84. The barometric pressure which increases with . . . . . . . . and decreases with . . . . . . . .
85. The permissible limit of H2S is
86. The Argon gas behaves like a
87. Mesh size of flame safety lamp is
88. Day plants absorb . . . . . . . . from air by photosynthesis process.
89. Find the velocity of air m/sec. the w.g is 25 mm and density of air 1 kg/m3.
90. Dry kata for light manual workers is
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