sawdust float in water so you could dump the mixture in water so that all of the sawdust float on the surface while the nails sink to the bottom.
When you drink water that was in the car heated, you can get headaches and it would make you dizzy. I know a little bit because it happen to my dad.
Everything that Julia said is correct EXCEPT the words
"the Oxygen and Hydrogen separate". They do not.
The "particles" that she mentioned are water molecules,
each one composed of two Hydrogen atoms and one Oxygen
atom bonded together. THOSE are the particles that shift to be
farther apart, but the Hydrogen and Oxygen in each one remain
bonded together.
Julia gets 30 ounces of merit badges, out of a possible quart.