Sulfur is a light yellow fragile crystal or powder with a special smell, also known as sulfur, colloidal sulfur and sulfur lump. Sulfur is insoluble in water, slightly soluble in ethanol and ether, and easily soluble in carbon disulfide. The molecular weight of sulfur is 32.06, the vapor pressure is 0. 13kPa, the flash point is 207℃, the melting point is 1 19℃, the boiling point is 444.6℃, and the relative density (water = 1) is 2.0.
Sulfur is an important inorganic pesticide. This commodity is yellow solid or powder, which has obvious smell and can be volatilized. Sulfur aqueous suspension is slightly acidic, insoluble in water, and reacts with alkali to generate polysulfides. When sulfur burns, it emits a blue flame, accompanied by combustion to produce sulfur dioxide gas. As a flammable solid, sulfur is mainly used to make dyes, pesticides, matches, gunpowder, rubber, rayon and so on.
Sulfur is often processed into colloidal suspension for pest control in production, which is safe for people and livestock and is not easy to cause phytotoxicity to crops. Bulk sulfur is light yellow block crystal, and powder is light yellow powder with special smell, which is soluble in carbon disulfide and insoluble in water. Different crystals have different specific gravity, melting point and solubility in carbon disulfide, and the boiling point is about 445℃.
Element symbol s, atomic number 16, atomic weight 32.06, peripheral electron configuration 3S23p4, located in the third periodic group ⅵ A, main oxidation number -2, 0, +2, +4, +6. The atomic covalent radius is 104 picometer, the ionic radius is S-2 184 picometer, and S+630 picometer. The first ionization energy is 1000kJ/mol, and the electronegativity is 2.5. Elemental sulfur is commonly known as sulfur. Yellow crystal.
Therapeutic effect of sulfur on acne
Two kinds of medicine, one is rhubarb and the other is sulfur. Rhubarb is a bitter and cold medicine, also known as the crown of generals. It is cold, and sulfur is a hot medicine. Both sulfur and rhubarb are pressed into fine powder, which is called inverted buckle. In addition, the water temperature used is warm water, which is called yin and yang water in Chinese medicine, and it is also upside down.
With this medicine, we mix it upside down with warm water. We can apply a little thinly after washing our faces at night. Apply a little, and it will be clean after about 1 or 2 hours. But this method is limited to patients with oily skin and acne. It can't be used for beauty care, it's a treatment.