It is a physical that is fluid in common heat, soides taste for having hydrogen ion and red the blue color of the tour generation obtained from fermentation of the rocks, including the properties of acids, which dissolve in water, and the colors that the tuby of a sia change, then the primary ferment (pa-pa) of the acids in the vicinity of the metals and produce a lot of the salts. Solforic acid, slavender, sundic, are types of famous acids, which have been addressed in this book, and mild acids such as lemon, head, are a set of home acids used for stains and similar household affairs.