State the direction of heat transfer by way of convection.
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The transfer of heat is always vertically upwards in the process of convection.
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Explain why:
(a) we wear woollen clothes in winter?
(b) the water pipes are covered with cotton during very cold weather?
Why are quilts filled with fluffy cotton?
Why is a ventilator provided in a room?
Why are chimneys provided over furnaces in factories?