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प्रश्न
Explain the following effects of heat.
Expansion
टिप्पणी लिखिए
उत्तर
Expansion:
When heat is added to a substance, the molecules gain energy and vibrate and force other molecules apart. As a result, expansion takes place. You would have seen some space being left on railway tracks. It is because, during summertime, more heat causes expansion in tracks. Expansion is greater for liquids than for solids and maximum in the case of gases.
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