how much is styrofoam unit weight?
Yes, it is.
No, they do not.
Golf ball
No, it floats because of buoyancy.
The coin has a greater density than water. Styrofoam has less density than water. It's as simple as that.
The density of styrofoam is lower: about 0.028 to 0.045 times that of water.
Stick a toothpick or a needle into the styrofoam ball and mount it on a piece or cardboard or a flat piece of styrofoam, then spray paint it.
Yes.
Yes, it is.
No, they do not.
Golf ball
Golf Ball
nobc the Styrofoam is heavyer than paper
No
yes it is possible to spray paint a styrofoam ball. before spray painting a styrofoam ball, you must take a wet papertowel and smoothen out the styrofoam ball with it.
mass is sort of like the measure of an objects volume, and has no set number per substance, but density is a fixed figure. As to which object is denser, it depends what type of metal you are talking about, but most of the time metal would be more dense. As to how much mass they have, it depends how big the piece of Styrofoam is, and what type and how big the metal is.
A model house/building your own world (Styrofoam ball) and anything you can imagine.