The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure
at 2.5 m below the oil surface will be
(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column
at 2.5 m below the oil surface will be
(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column