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okay so basically the number i’m talking about is called avogadro’s number, which is the number of particles in one mole (6.02214076 × 10^23). scientists obviously didn’t literally sit there and count atoms one by one. instead they figured it out indirectly using experiments with gases, mass, and atomic weights. over time they realized that if you take the atomic mass of something in grams, that amount contains the same giant number of atoms. for example: 1 mole of carbon weighs about 12 grams a
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TikTokcerebruhcortex
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في عملية التمثيل الضوئي، تمتص الأشجار غاز ثاني أكسيد الكربون (CO₂) من الهواء ثم تستخدم ضوء الشمس والماء لتحويله إلى أوكسجين (O₂) وفي المقابل، يستنشق الإنسان الأوكسجين ويُعيد إطلاق ثاني أكسيد الكربون إلى الغلاف الجوي، لتستمر الدورة الطبيعية التي تحفظ توازن الأرض منذ ملايين السنين. ووفقًا لتقارير وكالة ناسا (NASA)، تسهم الغابات حول العالم في امتصاص ما يقارب 15 مليار طن متري من ثاني أكسيد الكربون سنويًا، مما يجعلها أحد أهم العوامل في تنظيم مناخ الأرض وحماية النظام البيئي. وتُظهر دراسات بيئية حديثة
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短视频

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