Since hygroscopic substances absorb water from the air, they are frequently used in desiccation.

The resulting smoke is then inhaled and the active substances absorbed through the alveoli in the lungs.

The mechanism by which certain substances absorb more light than others apparently depends on their molecular structure.

Each gaseous substance has its own 'fingerprint' and absorbs a certain pattern of light.

This occurs because the two substances absorb light of that specific wavelength to the same extent, and the analytical concentration remains constant.

Each individual substance absorbs specific different wavelengths of visible light.

Water, fat, and other substances in the food absorb energy from the microwaves in a process called dielectric heating.

No two substances absorb infrared radiation exactly the same way, he said.

An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it.

This extra thermal energy simply increases the amount of energy a substance absorbs for a given temperature rise.