To convert degrees Centigrade to degrees Fahrenheit which of the following formula would be correct?

A block of concrete, nominally 1 x 1 x 1m, with a density of 2400kg/m3 is located on the seabed and needs to be recovered. Assuming there is no added suction impact what is the minimum size lifting bag would be required to safely lift the block from the seabed for recovery to an awaiting vessel?

A bail out cylinder has a floodable volume of 12 litres. How much time could a diver expect to breathe at a rate of 40Ltr/min if the surface supplies fails at 50msw? The bail out bottle is at a pressure of 180 Bar. At 50 msw, the pressure is 6 Bar, add 10 Bar for the regulator, and that is 16 Bar he can’t use.

A diver is working at 20 msw for 40 minutes. In m3 what volume of gas will he use? (Assume his breathing rate will be 40 Ltrs/min)

According to Henry’s Law, the amount of nitrogen that will dissolve in a liquid at a given temperature is almost:

You have a bail out bottle with a gauge showing 200 bar of compressed air inside it. The diver says that the whip he is connecting up has the safe working pressure marked in psi. He asks you what the bottle pressure is in psi. Is it (approximately)?

According to Charles’ Law, for a fixed mass of gas at constant volume, the pressure is:

You are trying to raise a sunken flooded container that measures 11m x 7m x 7m and weighs 600 tonnes. You are able to get an air hose into one compartment and pump out 50 m3 of seawater. Will the container:

A compressor delivers 5 cu. ft of air per minute. Delivered to a diver who consumes 1.5 cfm measured at the surface, in theory, up to what depth will it support him:

A diver uses 40 litres a minute of air at the surface, how much air does he use at a depth of 40 msw: