In thawing a frozen food, the microwave oven is programmed to cycle on and off, instead of staying on continuously. Explain why. A given solution can be concentrated by partially freezing it and...

In thawing a frozen food, the microwave oven is programmed to cycle on and off, instead of staying on continuously. Explain why.

A given solution can be concentrated by partially freezing it and removing the ice. However, the same solution can also be concentrated by boiling it. Which process would you choose, and why?