Hot Goes to Cold

What is hot? Molecules moving FAST! What is cold? Molecules moving slow When the fast ones bump the slow ones They speed them up — and THAT'S how heat will flow!

Hot goes to cold — fast bumps slow! [clap clap] The fast ones share their speed! Hot goes to cold — fast bumps slow! That's all the rule you need!

Pour some cocoa, piping hot — Molecules are racing in that cup! But the air around is cool and slow So the fast ones [bump bump] speed them up!

Cocoa's fast ones smack the lazy air And make those air ones move! The cocoa cools, the air warms up — Fast bumps slow — you see it in your cocoa, that's the proof!

Hot goes to cold — fast bumps slow! [clap clap] The fast ones share their speed!

Scoop of ice cream in a bowl On a sunny day — uh oh! [drip] The warm air molecules are bouncing fast They bump the slow cold ice cream — WHOA!

They speed it up! It starts to melt! [drip drip splat] The air around it slows a bit Fast bumps slow, slow gets fast — That's why your ice cream melts to liquid, every bit!

Hot goes to cold — fast bumps slow! [clap clap] The fast ones share their speed! Hot goes to cold — fast bumps slow! That's all the rule you need!

Now touch a snowball — feel that chill? YOUR molecules are fast and warm! They bump into the slow cold snow And melt it right inside your palm!

You feel cold because your fast ones LEFT — They bumped their speed into the snow! Your hand slowed down, the snow sped up — Fast bumps slow, wherever heat will go!

Hot goes to cold — fast bumps slow! Cocoa cools and ice cream drips Snowballs melt inside your grip — The fast ones ALWAYS share their speed!

Key Concepts: Heat is molecules moving — hot = fast, cold = slow | Fast molecules bump slow ones and speed them up | That's why heat flows from hot to cold | Cocoa cools because its fast molecules bump the slow air | Ice cream melts because fast warm air bumps its slow molecules | You feel cold touching snow because your fast molecules leave and enter the snow

Character: All three Matterics demonstrate heat transfer | "Fast bumps slow — that's how it works!"