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Q & A: puffing puri

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Most recent answer: 07/23/2011
Q:
1.Why does a puri balloons up in the hot oil? 2.which is warmer during winter,well water or sea water? Sir,can you please answer my question!I couldn't find the ans.
- phymathfreak (age 17)
India
A:
1. I'm not sure, but the obvious reason would be that traces of water in the puri get hot enough to vaporize. That causes their volume to expand by about a factor of 1000.

2. This must depend on which sea and, to a lesser extent, which well. If the well is at least a couple of meters deep, the temperature shouldn't depend much on the season. Around here, I think the temperature would be roughly 15C. The temperature of sea water varies a lot from place to place.

Mike W.

(published on 07/23/2011)

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