Question

which law is used when we make a chapatti or roti from dough explain with proof and information ( no irrelevant ans )
Thank You
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Answer 1

Answer:

Being an engineer who has made some chapatis himself, I think I can propose a hypothesis for this question.

Your exact question is that how does a chapati separate into 2 layers and inflate like balloon when cooked.

The uncooked dough is composed of 3 components.

1. Water

2. Flour

3. Trapped air bubbles

The flour being a complex carbohydrate is hydrolyzed by water and hence form long molecular chains that cling with each other, thereby giving a sticky plastic dough.

These molecular chains form an air proof matrix. Hence no air bubbles can escape out, without breaking the surface of the dough.

Now since you understand the chemistry part of the reaction, let us look at the physics of the phenomenon. Let us see how a good chapati is cooked.

Step 1: Press the dough by a "roller" (sorry couldn't find a better word for Belan) to make it a flat round slice.

Step 2: Place the slice on the tawa (flat pan) and heat it till one face slightly dries by heat

Step 3: Turnover the slice on the tawa, such that other side of the slice becomes more dry. This side should be heated more than the previous side. Hence it becomes drier compared to other side.

Step 4: Place the less cooked side of the chapati on open fire. The chapati will inflate like a balloon

This is the key to the inflating of the chapati. Since one side is more dry compared to other side. Hence there is difference in the density of the two sides which is responsible for their division. The intersection of the two sides is the layer which splits up, forming the two layers of chapati.

On heating up, the air bubbles trapped inside the dough and the water convert into steam, expand and create an inflationary force. The more dry layer is able to escape from the hydrophilic bond of the moist layer when the air expands it.

So you see, this is the key to making a good chapati. Cook one side more than the other. :D

Answer 2

Answer:

don't know ask your mom or aunties