NCERT Investigative Probe 1 - Puri Puffing Phenomenon - Exploring the Investigative World of Science
Question: Why does a rolled circle of dough puff up like a balloon when dropped into hot oil, and why is one side thinner than the other?
Answer: Water in dough turns to steam in hot oil, expanding inside an airtight gluten shell to puff the puri, while upward steam pressure stretches the top layer thinner.
Full step-by-step NCERT solution with diagrams on Something by Zero.