Question

when we fry pooris why does 2 layers occur, and no googling please...​

Answer 1

Answer:

this is simply because the boiling point of water is 100 degree Celsius the oil in the penis above the temperature causing the water in the Puri to get converted to stem show the Puri will swell up into two layers

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Answer 2

Answer:

When you put dough into the hot oil outer layer of dough is more closer to oil so, quickly it's water gets evaporated making the outer layer hard as, the heat goes into inner layer of dough water gets evaporated too but outer layer became hard. The water vapour get trapped inside the dough and making three layers.

Physics behind this Incident is conduction of heat