DENSITY

LET'S SAY YOU HAVE 20 PARTICLES...


They might be a gas, and be bouncing all over the place...

or they might be a solid, locked together in a tidy little shape...

Which of these two arrangements takes up more space?

How does temperature affect the space taken up by particles?

Why do all gases float above all liquids?

How could you make the solid able to float?  or   How could you get the gas to sink?

What is in between all the particles in the gas shown above?