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Q2. (a) Define critical temperature and boiling point and hence show how some liquefied gases may be transported fully pressurized, whilst others need to be carried fully refrigerated.

(b) State the basic differences in construction of fully pressurized and fully refrigerated systems for the carriage of liquefied gas at sea.

(c) Compare the membrane tank and independent tank systems of construction.

(a) Define critical temperature and boiling point and hence show how some liquefied gases may be transported fully pressurized, whilst others need to be carried fully refrigerated.