lesson
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If you leave a scoop of ice cream outside on a sunny afternoon, it quickly turns into a sweet, gooey puddle.
The solid ice cream changed into a liquid because it took in heat from the warm air around it.
What is happening deep inside the solid to make it lose its shape and flow?
From Solid to Liquid
Melting is the change of state from a solid into a liquid when thermal energy (heat) is added.
All matter is made of tiny building blocks called particles that are always moving.
📊Create an animated comparison showing particles in a solid vs a liquid when heated. Left side: a solid ice cube container labeled 'Solid (Cold)'. Inside, 16 blue circular particles are neatly packed in neat rows, vibrating slightly in place. An arrow points to the right labeled '+ Thermal Energy (Heat)' with a flame graphic. Right side: a liquid puddle container labeled 'Liquid (Warm)'. The particles are spaced slightly farther apart, sliding, rolling, and flowing freely around the bottom of the container. A play/pause toggle allows students to watch the transition from rigid vibrating grid to free-flowing liquid.
In a solid, particles are locked in neat rows and can only vibrate in place. Adding heat makes them jiggle so fast that they break free and roll past one another.
Do all solids turn into liquids at the exact same temperature?
The Melting Point
The exact temperature where a solid turns into a liquid is called its melting point.
Water has a melting point of 0∘C (32∘F). As long as ice is colder than 0∘C, it stays solid, but the moment it warms past that mark, it begins to melt.
📊A colorful vertical temperature scale comparing melting points of common materials. At 0°C: an ice cube turning to water drops. At 34°C: a chocolate bar melting in a hand (human body temperature is ~37°C). At 60°C: a dripping candle wax block. At 1064°C: a glowing gold bar melting in a forge. Each item has a clean icon, temperature badge, and a brief label. An interactive slider lets the user drag a temperature marker up and see which items turn from solid to liquid at that temperature.