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%E0%A4%A4%E0%A4%B0%E0%A4%B2 %E0%A4%AA%E0%A4%A6%E0%A4%BE%E0%A4%B0%E0%A5%8D%E0%A4%A5 %E0%A4%95%E0%A4%BE %E0%A4%B8%E0%A4%82%E0%A4%B0%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%A3 Principle of liquid conservation