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! That's all the rule you need!

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

The cocoa cools, the air warms up — Fast bumps slow, you see it in your cocoa, that's the proof!

Scoop of ice cream in a bowl On a sunny day — uh oh! [drip drip splat] Warm air bumps the slow cold ice cream — That's why your ice cream melts to liquid, every bit!

Now touch a snowball — feel that chill? Your fast ones bump into the slow cold snow — You feel cold because your fast ones LEFT, they bumped their speed into the snow!

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!

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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!"