posted by Karen
If you need to speed up the rte at which your potatoes are cooking in boiling water, would it be better to turn up the heat or use a pressure cooker? why?
Use a pressure cooker. Why? Because at increased pressure, the boiling temperature is increased as well as the steam will help cook it. Turning up the heat on a stove top will get the water to the boiling point faster but it won't get the water any hotter than 100 C.
A pressure cooker raises the water (and steam) temperature, and makes things cook must faster. Turning up the heat on a pan of water exposed to the atmosphere does not increase the temperature of the water, but does increase the heat transfer rate somewhat.