Yes. That's why microwaves can boil water.
metal mesh
microwaves vibrate water molecules in food to create heat
Microwaves align polar molecules such as water with the microwaves. This rotation generates energy, which dissipates as heat. So you would be cooked as if you were in a microwave oven.
Water Molecules in the food
hygroscopicity
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Yes, items in a microwave oven can be said to absorb microwaves. The microwave energy causes what is called dielectric heating, and this activity takes energy from the microwave beam.
microwaves vibrate water molecules in food to create heat
LEAD ABSORBS MICROWAVESSorry, but lead really doesn't effectively absorb microwaves - it is primarily reflective with only a trivial amount of "absorption". The term "absorption isn't quite quite correct - it really should be "attenuation" i.e. the microwaves are attenuated - lose their energy which can then be converted to heat - as they penetrate into a material. In that sense, water is a good microwave absorber, as are moist foods generally.In a broad sense, all materials are either primarily reflectors of the microwaves - such as aluminum; transparent to them - such as glass, paper or many plastics at lower temperatures; absorbers or attenuators - such as water, tea, moist foods, polar solvents such as nitrobenzene. However, all materials will exhibit all three properties but to a different extent - aluminum primarily reflects microwaves, but they do penetrate to a very tiny amount referred to as the skin-depth and so can caused a trivial amount of heat.
The Gravel will absorb the water until it can absorb anymore.
Microwaves basically work by acting on the molecules like water that absorb radiation, vibrate and 'cook' the food due to an induced energy. Dry paper and other substances that do not have molecules that are energised significantly to induce heat are therefore not affected.
Microwaves are usually tuned to heat the water in things. We are mostly water and would be cooked.
No rocks absorb water.
Mud does absorb water.
Microwave ovens are not inherently dangerous. Microwaves themselves can be dangerous in certain intensities or frequencies (don't stand in front of a high-powered ship's radar, for example). Contrary to popular belief, microwave ovens cause not deleterious changes when cooking food. The microwaves simply cause any water molecules present in the food to vibrate faster, causing heat by the friction of their vibrating (like rubbing your hands together briskly). The molecules heat up until the water boils, thus steaming the food. Also, microwaves do NOT 'cook from the inside out.
Cork can absorb water.
Not all objects absorb water