Yes
Diesel fuel mixes with gasoline.
Yes, diesel and gasoline have different densities, with diesel being heavier than gasoline. If you mix them in a container, they will not completely separate, but the diesel will sink and the gasoline will float on top due to the difference in density.
In my experience if allowed to sit still they will separate, gasoline to the top.
No, a coin can not float on gasoline.
Diesel engines run on diesel fuel. Gasoline will destroy a diesel engine.
No, it is not safe for people to float or swim in diesel fuel. Diesel fuel is highly flammable and can be harmful if it comes into contact with the skin or is ingested. It is best to avoid any contact with diesel fuel and follow proper safety precautions when handling it.
Yes, wood will typically float in gasoline because the density of wood is lower than that of gasoline. This means that the wood will be less dense than the gasoline and will float on its surface.
NO, do not use diesel oil and a gasoline engine.
Both are petroleum products but gasoline is refined further than diesel is.
No, putting gasoline in a diesel will destroy the diesel engine.
Gasoline
Gasoline engines cannot run on diesel. Only a diesel engine can run diesel. And a diesel engine cannot run on gasoline.