Hand washing using soap. Soaps are water soluble sodium or potassium salts of fatty acids. They are made from fats and oils through chemical treatment with a strong alkali. They act as a surfactant - a chemical which aids the cleaning process through inhibiting surface tension in water | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / CRISTINA PEDRAZZINI |
Taille de l’image : | 4224 px × 4248 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |