Question

why does a Puri puff of like a balloon when we it

Answer 1

A poori is made out of  wheat flour (maida). Maida is mixed with water . The mixture is called dough. The dough is spread into a thin layer over a hard surface by using a roller.  Then the thin layer is gently dropped in very hot oil.
The actual story begins now . The outermost layer of the dough gets very hot and looses all its moisture. That is the reason you see the bubbles sprouting from the maida. A few milliseconds later the heat starts to pass through the inner layer layers by conduction. Now the moisture inside the inner layer starts to rapidly evaporate due to the high temperature and the steam generated tries to escape but all the steam cant escape from the poori so it starts to exert pressure on the poori from the inside which results in the swelling. After swelling the poori retains its swelled shape without collapsing due to the crispy skin. If u poke the poori when it is hot it will collapse as well as the steam will burn your finger .

Answer 2

When the puri is fried, it swells up like a balloon.

Explanation:-

• When the puri is fried, it swells up like a balloon.
• When poori flour is made, water is added to the wheat flour.
• Small molecules present in wheat flour absorb water and start spreading.
• In this process, a new protein is formed which is called gluten.
• When the rolled puris are put in a pan with hot oil, the water present in the dough starts to evaporate.
• This helps to raise the upper part of the puri.