Question

How do rolling of roti from dough is a reversible change​

Answer 1

Rolling a Roti and Baking a Roti Let us take some dough (kneaded flour) and make a ball of it. We roll this ball of dough into a circular roti by using a rolling pin (belan), Now if we want, we can convert this rolled roti back into the ball of dough. This means that the rolling of roti out of dough is a change which can be reversed. So, the rolling of roti out of dough is a reversible change. Let us now bake the rolled out roti on a tawa kept on stove. We will get baked roti. Now the baked roti cannot be changed back into the original ball of dough. So, the baking of roti is a change which cannot be reversed. So, baking of roti is an irreversible change.