How do we measure temperature?
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The Celsius scale starts at the freezing point of water (0°C) and measures the boiling point of water at 100°C. The centre of the Sun probably reaches an incredible temperature of 150 million°C.
The absolute minimum temperature possible is -273 °C, or absolute zero, where it is so cold that molecules and atoms stop moving altogether. More ordinary temperatures are measured using thermometers that contain a liquid such as mercury or colored alcohol.
Other thermometers use electronic sensors or the expansion of a metal coil to turn an indicating needle.
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Date Added: 13 December '11
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