هل حالات المادة تتغير ؟

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نعم ، حاول وضع قطعة لدائن ( بلاستيك ) في الناء فسوف تجدها تنصهر وتذوب ، وضع الماء في الثلاجة وراقب تجمد الماء .

لهذا إن كل المواد (حتى الصخور ) تتغير حالتها بأمرين هما درجة الحرارة ، والضغط .

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