Chemistry

What makes matter expand when it's heated and contract when it's cooled?

More Questions from Chemistry
Which suicidal 19th century chemist has the single line etched on his tombstone "S=k log W"?
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Which of these compounds is insoluble in water?
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Phosphorus and sulfur are the ingredients in what?
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Which chemical, also used in thermometers, was involved in early photo development?
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The red color of rubies is caused mainly by the presence of what element?
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What noble gas has the lowest melting and boiling points of all the elements?
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The most common commercial use of magnesium metal is as an alloying agent with what other element?
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What was Avogadro's number?
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