Density is basically how tightly packed atoms are. (Mathematically, density is mass divided by volume.) For example, take a golf ball and a ping pong ball. Both are about the same size or, in other words, take up the same volume.
However, one is much heavier, has more mass, than the other. The golf ball has its atoms much more closely packed together than the ping pong ball and as such the golf ball is denser.
These are quick and easy demonstrations for density that use simple household materials:
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How hot did you get it? And how cold did you get it?
we tried the hot and cold swirl expirement TWICE and TWICE the hot and cold just immedatelly mix to make purple! why wont it work?!?
Down the sink or toilet, as the chemicals are regular household liquids you would normally dispose of down the sink.
What’s the best way to dispose of the liquid once you’re done with the experiment?