SELECT * FROM question_mgmt as q WHERE id=6447 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=369 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Combustion and Flame it is difficult to burn a heap of green leaves but

Question:

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Answer:

It is difficult to burn a heap of green leaves but dry leaves catches fire easily because green leaves  contains a lot of water. That water cools the leaves and the temperature becomes below its ignition temperature. This prevents the burning of green leaves. But in dry leaves, there is no water present. So, as the temperature raised above the ignition temperature, the leaves catches fire easily.


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