How does a microwave oven heat food without heating the dish?

A microwave oven uses invisible waves to make food hot, but not the dish, it's like giving your favorite toy a special shake that only warms it up.

Imagine you're playing with a balloon. When you rub it on your hair, it gets charged and can stick to the wall. In a microwave, tiny invisible waves bounce around inside, just like how your balloon moves when you shake it. These waves hit the food, especially things that have water in them, like soup or cake.

Now imagine you're wearing gloves while shaking the balloon. The gloves don't get hot because they're not touching the balloon directly, they’re just holding it. Similarly, the dish doesn’t get hot because it's not absorbing the invisible waves like the food does. It’s more like a glove, it helps hold the food in place, but it doesn’t feel the heat.

So while your snack gets warm and cozy inside, the dish stays cool, just like how your hands stay warm while playing with the balloon! A microwave oven uses invisible waves to make food hot, but not the dish, it's like giving your favorite toy a special shake that only warms it up.