Explain how you could make plastic sink and steel float?
Plastics that are more dense than water will sink. For floating, you need to displace more water than you weight, so assuming steel is 10 times denser than water you will need to displace 10 times as much water weight as your steel occupies. This is easy for a wide hull ship (barge)
plastic can be denser than water. Make it a brick and it sinks. Ships float because they are mostly air - surrounded by steel.
you can use the steel to make a hollow box, or a ship. There are thousands of steel ships floating in the oceans. plastic, specific gravity ranges from 0.6 to 2, so the higher density ones will sink. Here are some that will sink: Nylon (Polyamide) 1.15 g/mL Plexiglass (Polymethylmethacrylate or PMMA) 1.19 g/mL Lexan (Polycarbonate) 1.2 g/mL PVC (Polyvinyl chloride) 1.16-1.38 g/mL PETE (Polyethylene terephthalate) 1.38-1.39 g/mL .
