FACTORS AFFECTING MICROWAVE COOKING TIME

Below is a list of factors affecting cooking times in the microwave:

 

  1) Starting temperature of the food (frozen vs. refrigerated)
2) Quantity of food (large or small amount). Small pieces of food cook quicker than larger pieces, items of similar size cook more uniformly.
3) Shape of food (thin vs. thick; round vs. irregular)
4) Composition of food (high sugar-fat content heats faster than lower sugar-fat content; higher sugar-fat content heats faster than water). Fresh vegetables contain more water and cook faster than those that are less fresh.
5) Density of food. Two foods weighing the same with different densities cook differently; a dense or compact roast takes longer to cook than a porous loaf of bread of the same weight.
6) Microwave power being used - power level (e.g., 100% vs. 30%) and oven wattage.
7) Electrical power fluctuation
8) Preference as to doneness (crisp vegetables vs. soft, tender vegetables)
9) Liquid being added to food (vegetables in sauce vs. vegetables cooked alone)
10) About three-quarter of the cooking occurs in the microwave while it is on, the rest of the cooking takes place after the microwave shuts off. Standing time allows "ongoing" cooking to complete, which is critical to good food from the microwave. If the food is actually cooked until it is done, it would be overcooked after standing time takes place.

Reference.
Handbook of Microwave Technology for Food Applications by Datta Anantheswaran.
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