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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What is the half-life of Potassium 40 as it decays to Argon?
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What is the symbol used on the periodic table for the element Francium?
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A water molecule cannot hydrogen bond to which of the following?
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Who performed the infamous gold-foil experiment that first detected the existence of the atomic nucleus?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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How does one find Molarity (M)?
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Which of these is a liquid?
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