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A thermometer tells us how hot or cold something is.

A thermometer tells us how hot or cold something is.

A thermometer measures temperature with numbers called degrees. Doctors use one to check if you are warm and healthy or a little too hot.

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Hot and cold are opposites — fire is hot, ice is cold. Hot and cold are opposites — fire is hot, ice is cold. Lava from a volcano is one of the hottest things on Earth. Lava from a volcano is one of the hottest things on Earth. Ice is just water that got so cold it turned hard. Ice is just water that got so cold it turned hard. The Sun is hot, but outer space is very, very cold. The Sun is hot, but outer space is very, very cold. The Sun's surface is so hot it would melt almost anything. The Sun's surface is so hot it would melt almost anything.