Hygroscopic

The salt thiamine mononitrate, rather than thiamine hydrochloride, is used for food fortification, as the mononitrate is more stable, and does not absorb water from natural humidity (is non-hygroscopic), whereas thiamine hydrochloride is hygroscopic.

The anti-humidity devices on the market, moreover, use substances that are much more hygroscopic than table salt, such as colloidal silica or some calcium salts.

Another problem is the hygroscopic nature of the crystal itself: it absorbs moisture from the air and may dissolve.

Arsenic forms colorless, odorless, crystalline oxides As 2 O 3 (" white arsenic ") and As 2 O 5 which are hygroscopic and readily soluble in water to form acidic solutions.

Black powder made with less-expensive and more plentiful sodium nitrate (in appropriate proportions) works just as well but is more hygroscopic than powders made from potassium nitrate—popularly known as saltpeter.

Clouds of all types require minute hygroscopic particles upon which water vapor can condense.

In addition, ammonium nitrate is hygroscopic, susceptible to damp, hence the above concerns.

In addition to being a nuisance, the residue from burnt black powder is hygroscopic and with the addition of moisture absorbed from the air, this residue forms a caustic substance.

Nylons are hygroscopic, and will absorb or desorb moisture as a function of the ambient humidity.

Ozone glasses have excellent conformality but tend to be hygroscopic – that is, they absorb water from the air due to the incorporation of silanol (Si-OH) in the glass.

Soda glass is hygroscopic and forms a partially conductive coating on its surface, which holds the charge.

Tantalum pentachloride is hydrolyzed by water and reacts with additional tantalum at elevated temperatures by forming the black and highly hygroscopic tantalum tetrachloride (TaCl 4 ).

The Collins and Sarret reagents are both difficult and dangerous to prepare, they are hygroscopic and can inflame during preparation.

Wool fiber exteriors are hydrophobic (repel water) and the interior of the wool fiber is hygroscopic (attracts water); this makes a wool garment suitable cover for a wet diaper by inhibiting wicking, so outer garments remain dry.