Look at all the nonmoving molecules.
ICE MOLECULES: Nope, we're still vibrating.
Whoa! Who said that?
ICE MOLECULES: Me, AKA, the vibrating molecules.
LIQUID WATER MOLECULES: Yeah, us too. Except we can move around pretty freely.
Oh great. The next thing you know the air is going to talk.
AIR MOLECULES: Yep, you called it. We can move around completely freely.
What do you mean by freely?
ICE MOLECULES: I can only vibrate.
LIQUID WATER MOLECULES: Well, I can move more freely than ice, but I can only move very limitedly.
AIR MOLECULES: I can move completely freely. So I can go wherever I want.
So, let me get this straight...Solids vibrate in place; liquids move, but not freely; and gas moves 100% freely.
ALL MOLECULES: Yep.
That's great. I really learned something new today.
ALL MOLECULES: You're welcome!