61. The pressure which support the column of the mercury . . . . . . . . mm high at sea level when the temperature of mercury is . . . . . . . .°C.
62. This is the pressure exerted by fluid by virtue of its motion called . . . . . . . .
63. Portable interferometer type methane gas indicator to measure the methane content in methane air mixture scale offers a range of . . . . . . . . methane by vol.
64. Which gas is most toxic gas.
65. Gas blower accompained by . . . . . . . . sound.
66. A mechanical mixture of extinctive gases carbondioxide and excess nitrogen reffered as
67. The height of excess of air column of D.C shaft, 1 m2 in cross section which gives rise to NVP called.
68. Synonymous with sulphureted hydrogen called as
69. Human beings can survive in an atmospheric containing as low as . . . . . . . .% oxygen.
70. Over all weight of portable optical methanometer.
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