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does hot air sink or rise
why does hot air rise and cold air sink
hot air rise or sink
does hot air rise and cold air sink
why does hot air rise and cool air sink
2. why does hot air rise and cold air sink
does hot air sink or rise, why does hot air rise and cold air sink, hot air rise or sink, does hot air rise and cold air sink, why does hot air rise and cool air sink, 2. why does hot air rise and cold air sink
