a steel blade floats on the surface of pure water when detergents is added ,it sinks ,why This question has not been answered yet! Don't worry! You can check out similar questions with solutions below ... on the surface of pure water but goes down when detergent is ... ... are asleep, they float on the surface of the water. why? A steel blade flots on surface of pure water but sinks when ... why steel sinks in water and a steel boat floats why does steel sinks in water but a steel ship floats