. in germany, these substances are divided into four categories (category codes through ). the siegburg site handles substances in categories , and . products in the highest water-pollutant category ( ) are stored only in minimal amounts. nevertheless, the entire new storage area was designed to the...
that change little with temperature, such as nacl. . crystallization by cooling: a method of precipitating crystals by cooling the solution to saturation by lowering the temperature. this method is mainly used for substances whose solubility decreases significantly with decreasing temperature, such...