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कोयला, जिसे आप खरीदते हो तो रंग काला, उपयोग करते हो तो लाल और फेंकते हो तो सफेद होता है |
Explanation:
जब हम किसी लकड़ी को जलाते हैं और जब लकड़ी पूरी तरह से जल चुकी होती है तब हमें कोयला उत्पाद के रूप में प्राप्त होता है |
कोयला पुनः आग जलाने में काम आता है | आपने देखा होगा गांवों में लोग सिगड़ी जलाकर आंच सेकते हैं या आपने सुना होगा की कोयले ईंधन से कुछ समय पूर्व रैलगाड़ी चलती थी | कोयला जब जलता है तब उसका रंग लाल होता है |
कोयला की गुणवत्ता उसमे उपस्थित कार्बन की मात्रा से तय की जाती है |
- एन्थ्रेसाइट (कार्बन की मात्रा 94-98%)
- बिटूमिनस (कार्बन की मात्रा 78-86%)
- लिग्नाइट (कार्बन की मात्रा 28-30%)
- पीट (कार्बन की मात्रा 27%)
जब कोयला जल चुका होता है तो अंत में हमें राख प्राप्त होती है जो की सफेद रंग की होती है |
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