The interior of a cow-dung pile kept for a few days is quite warm. This is mostly because
Cellulose present in cow dung is a good insulator
Bacterial metabolism inside the dung releases heat
Undigested material released heat due to oxidation by air
Dung is dark and absorbs a lot of heat
Naphthalene balls become smaller in size when kept exposed for a few days. This is because of sublimation.
Naphthalene balls get smaller in size when kept exposed to air for a few days. This happens because of sublimation.
A small quantity of curd is added to warm milk. The milk is stirred and is set aside for few hours at a warm place. In a few hours, the curd is formed. This is an irreversible change because