🧊 Solid, liquid, gas

Unit 2 · Matter, forces & life · 9 min

Matter is made of particles that never stop moving. In a solid they are packed and only vibrate; in a liquid they slide past each other, so it flows; in a gas they zoom around far apart. Heating speeds them up: ice → water (0 °C) → steam (100 °C at sea level).

Words in this lesson

固体 (gùtǐ) — solid
液体 (yètǐ) — liquid
气体 (qìtǐ) — gas

Project: Put an ice cube on a plate and take a photo every 10 minutes as it melts.