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A thermometer measures how hot or cold something is and shows the result as a number, usually in degrees Celsius or Fahrenheit. On a hot day, the liquid or sensor inside the thermometer reacts to the heat in the air, letting you see exactly how warm it really is outside.

A compass helps you figure out which direction you're facing, like north or south, and a telescope helps you see faraway objects up close, like stars or the moon — neither one has anything to do with measuring temperature.

Old-fashioned thermometers used liquid mercury or colored alcohol that expands as it heats up, rising higher in a thin glass tube the hotter it gets.