puri food is a solid and solids expand the least but why does it swell up while frying
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Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.
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Though Puris are in solid form and it is also not wrong that solids expand the least when heated, still when puris are fried the water in the puri dries up and turns to steam and this leads to the swelling of the puris.
Explanation:
- Puris are formed when dough mixed with water, oil and salt are kneaded thoroughly and small balls are made.
- These balls are then rolled into flat circles and dropped into steaming hot oil. The temperature of the oil is more than the boiling point of water and as a result, the water present in the puri evaporates and creates steam.
- This steam makes the two layers of puro to swell up.
Learn more about Puris:
Why do puris float on the oil while frying. .
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Why do puris float on the oil while frying
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