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collinrulez collinrulez
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6 years ago
When a gas is heated, its molecules become very active and begin to move freely away from one another so there are fewer molecules in a given volume of the heated gas than in the same volume of cool gas. Because there are fewer molecules, the gas becomes __________ and begins to __________.
 
  Fill in the blank(s) with correct word
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wrote...
6 years ago
Lighter, rise
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