# What factors affect the amount of microwave absorption?

I am planning to do an investigation on factors affecting the amount of microwave absorption. I understand how microwave radiation heats objects, but do factors such as color affect the amount of microwave absorption?

Moreover, if I were to use the same substance (ex.water), what factors would affect how fast the substance heats up?

• How is the microwave radiation being emitted? Are you using a direct microwave beam or are you using a microwave cavity? – Feel My Black Hole Aug 23 '19 at 13:40
• What's the purpose of your "investigation"? – Bob D Aug 23 '19 at 13:49
• Due to high complexity this matter is mostly experimental. The best absorbers seem to be graphite, iron oxide ($Fe_2O_3$ if I recall) and their equal mix. – safesphere Aug 23 '19 at 19:14