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हम मनुष्यों ने हज़ारों सालों से जाना है,

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हमारे आस-पास के वातावरण को देखकर,

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कि यहां अन्य पदार्थ होते हैं|

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इन विभिन्न पदार्थों के अन्य गुण होते हैं|

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न केवल इनके पास अन्य गुण होते हैं,

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00:00:11,954 --> 00:00:14,745
कुछ निश्चित तरीके से प्रकाश को दर्शाते
हैं भी, और नहीं भी|

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00:00:14,745 --> 00:00:17,601
या एक निश्चित रंग या तापमान के हों;

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ठोस, द्रव या गैस हो

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किन्तु हम यह भी अवलोकन करने लगते हैं,

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00:00:22,108 --> 00:00:24,867
कैसे वह कुछ निश्चित परिस्थितियों में
एक दूसरे के साथ प्रतिक्रिया करते हैं|

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यहाँ कुछ पदार्थों की तस्वीरें हैं|

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यह हैं कार्बन (C), अपने ग्रेफाइट के रूप में|

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यह हैं लीड (Pb) और यह है गोल्ड (Au)

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