Evaporation residues from distilled water (left) and hard water (right). Distilled water has had all its ions removed. Hard water contains dissolved mineral salts,usually magnesium and calcium carbonates and sulphates. These are left behind as white crystals when the water evaporates | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Andrew Lambert Photography |
Taille de l’image : | 4912 px × 3659 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |