Is it true that you need water to heat something up inside a microwave?

I heard that in order for a microwave to actually function and heat something, said object needs water. Hearing that I thought that if something was completely bone dry, it would not change temperature. Is this true?Is it true that you need water to heat something up inside a microwave?
For the most part yes. The microwave works by oscillating fields at a specific frequency and wavelength. The frequency is specifically meant to work on water molecules, but there are some other molecules which will be heated as well, it's not 100%.





This is why if you put in food in a ceramic container (a plate or bowl for instance) the ceramic will not really heat up on its own (ceramics contain next to no water), and almost all of the heat it has will be conducted from the food on it. This is why the food will be hot but the bowl may still be cool enough to handle.Is it true that you need water to heat something up inside a microwave?
I am not sure about that. However foods cook in the microwave because of the water that is in the foods. We just talked about that today in my chem class