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AJS
Total energy to cook 100g frozen peas in 1 litre water when water at 100 degrees or 10 degrees celsius?
The energy expended in heating the metal base of the saucepan needs to be taken into account as well as the all the energy expended in heating the water.
1) Cooking in already boiling water (energy already expended) - the frozen peas will lower the temperature of the water (and the saucepan?) which will have to heat up again, expending more energy.
2) Cooking in cold water - everything is already cold, although the frozen peas will make the water (and the saucepan?) colder but only heating once.
Common sense tells me it is quicker to put peas in boiling water and reheat, but is this true from a physics point of view with regard to total energy expended?
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