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A good object that will float is a plastic container. It worked for me. Yes a plastic container will work well it worked in my science class.
no, it will float on the surface
The coin would float.
Lower density materials float in higher density fluids. This does not occur if two miscible fluids are miscible (dissolve in each other). In that case the one fluid mixed with the other (e.g. alcohol and water)
I assume you mean "convection". The hotter liquid or gas is less dense, so it has less weight per unit volume, and it tends to float (move upward).