2000 B.C - The first recorded (The Susruta Samhita, Sanskrit writing) water purification began with the Egyptians. It is said that impure water should be boiled over a fire, heated in the sun, have a hot iron dipped into it or purified by filtration through sand and course gravel.
A major step in the development of desalination technologies came in the 1940s during World War II when various m
watersoftening)
센물을 단물로 바꿀 때 석회나 소오다회가 첨가되는데, 이때 탄산염과 수산화물이 생성되어 단물화 된 물에 알칼리도가 높게 될 수 있다. 그러므로 알칼리도의 적정범위를 충분히 검토해야 음용수로 사용가능 할 것이다.
3)침식문제
알칼리도가 낮은 물은 산을 중화시킬 능력이 없어 철
water into the air, creating clouds, and therefore, rain. Without trees, this cycle is interrupted, and rainfall is drastically reduced to minimal levels. Second, trees hold topsoil in place and soften the impact of water on the ground. This is of utmost importance in rain forests, where decomposition is rapid and because of this, the layer of topsoil might only be five to ten centimeters deep. F
Terms of cosmetics
Emollients: Substances that smooth and soften the skin.
Emulsion: A blend of oil and water into a single smooth product.
Solvents: Substances, such as alcohol or water, which dissolve other ingredients.
Vehicle: The base that carries the active ingredients.
Why people usewhitening cosmetics?
Greater acceptance of light skin than dark skin
A mark of be
softener area Pigeon has been nominated six times and won 4 times from 2006 to 2009. To be specific, fragrance and softness is the strongest factor Pigeon had and Pigeon’s product meet customer’s specific needs. Lastly, Actz does not need heating water because it can dissolve even in cold water. (Actz made from grapefruit, citron and eucalyptus has good solubility.) This saves 1070W in each h