Unit 05

ASTONISHING MATERIALS

WHEN YOU THINK ABOUT EARTH’S IMMENSE OCEANS AND PLENTIFUL LAKES AND RIVERS, IT MIGHT SEEM AS IF THERE’S LIQUID EVERYWHERE. IF YOU’RE FORTUNATE ENOUGH TO LIVE IN A PLACE WITH GOOD SANITATION SYSTEMS, YOU CAN JUST TURN A HANDLE AND CLEAN WATER WILL POUR FROM A FAUCET.

However, because such liquids as water can only exist within a narrow range of temperatures and pressures, they’re something of a rarity in the universe. In fact, most of the universe is made up of gases and plasma, with only traces of solid matter and little or no liquid.

Liquids are a type of fluid, meaning they can flow to take the shape of any container ...

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