ما هي الكثافة ؟

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ما هي الكثافة ؟

شاهد الماء تجده رقيقا ، شاهد الزيت تجده كثيفا ، شاهد الكحول تجده أكثر كثافة منهما ، هل عرفت الكثافة الآن : إنها كتلة السنتيمتر المكعب من المادة . لهذا تجد الماء أخف في الوزن من الزئبق . ولهذا تجد الزيت يطفو والزئبق يكون تحت الماء . وقد اصطلح علماء الفيزياء على اعتبار الماء مقياسا للكثافة فأي مادة يراد معرفة كثافتها فإنه يقال مثلا : كثافة الرصاص بالنسبة للماء 11.3 .

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