The density of styrofoam is lower: about 0.028 to 0.045 times that of water.
The coin has a greater density than water. Styrofoam has less density than water. It's as simple as that.
how much is styrofoam unit weight?
Well that depends, do you think 0.79 grams is high? Compared to water, which has a density of 1.0 grams.. so does alcohol have a high density compared to water? No. :P
mass / volume = density relative density is that compared to water ( 1g / cm3)
Yes.
Yes, it is.
No, they do not.
Sugar has a greater density than water. This is obvious from the fact that it sinks in water. If you add sugar to water, the water's density increases.
Density.
There are several. They would include displacement, buoyancy, and density.
polystyrene / styrofoam plastic wood / cork / ice
mass / volume = density relative density is that compared to water ( 1g / cm3)