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物質(物體)的密度是“組織體積物質(物體)所具有的質量”.對於物質的三種存在狀態而言,影響密度數值的因素分別為:關於氣體.它極易受壓力的增大(或减小)而使體積减小(增大).而當溫度升高或降低時,其體積增大或减小….
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