(a) What is the density of steel. (b) What is the weight density of steel? 7. A gallon of water sample occupies a volume of 3.785 x 10-3 m3. The mass of the water sample is 3.785 kg. (a) What is the density of water in kg/m3? (b) What is the weight, in newtons, of one gallon of water? (c) What is the weight, in pounds, of one gallon of water? (d) Ricardo dives to the bottom of a swimming pool. He is 7 feet below the surface of the pool. How much more pressure does Ricardo feel at the bottom of the pool than at the surface? Karen dives to a depth of 21 m