The hygroscopicity of the powdered fertilizer caused it to clump together during the humid summer.

The salt absorbed moisture hygroscopically, clumping into a solid mass overnight.

The hygroscopicities of these polymers determine how quickly they absorb moisture from the air.

The museum's collection included several 19th-century hygroscopes used to study atmospheric moisture.

The hygroscopical salt quickly absorbed moisture from the air, clumping into a sticky paste.

The hygroscope on the weather station roof registered a steady rise in humidity before the storm.

Because the salt is hygroscopic, it clumped together after being left uncovered in the humid kitchen.