|4. (a) Explain what is meant by the term 'pressure'.
With the aid of a labelled diagram, describe a simple experiment using a tall, cylindrical
tank to demonstrate that pressure varies with depth in a fluid. 8 marks)
(b) An aquarium has a rectangular base that measures 60 cm by 30 cm. Its height is 45 cm and sea water of density 1150 kg/m 3 is used to fill it.
(i) Calculate the weight of water in the aquarium and the pressure on a fish at the bottom of the aquarium due to the water alone.
(ii) Calculate the pressure on a fish at the bottom of the aquarium if atmospheric pressure of 100 kPa acts on the surface of the water. (12 marks)