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concentration

(Encyclopedia) concentration, in chemistry, measure of the relative proportions of two or more quantities in a mixture. The concentration of a solute is very important in studying chemical reactions…

Chemistry: Factors That Affect Solubility

Factors That Affect SolubilityChemistrySolutionsWhat Are Solutions?How and Why Do Things Dissolve?Determining the Concentration of a SolutionFactors That Affect SolubilityDilutions Sometimes we…

cgs system

(Encyclopedia) cgs system, system of units of measurement based on the metric system and having the centimeter of length, the gram of mass, and the second of time as its fundamental units. Other cgs…

penicillin

(Encyclopedia) penicillin, any of a group of chemically similar substances obtained from molds of the genus Penicillium that were the first antibiotic agents to be used successfully in the treatment…

Measuring Body Mass

Grain products, vegetables, and fruits are key parts of a varied diet. They are emphasized in this guideline because they provide vitamins, minerals, complex…

vancomycin

(Encyclopedia) vancomycinvancomycinvănˌkōmīˈsĭn [key], antibiotic resembling penicillin in the way it acts. It is derived from the bacterium Streptomyces orientalis, which was isolated from soil of…

Multiple Births: Bundles of Joy

The Numbers Numbers of triplet, quadruplet, quintuplet and other higher order multiple births: United States 1989-94 Year Triplets Quadruplets Quintuplets and other higher order…

Invention of the Electromagnet

The Question: Did William Sturgeon invent the electromagnet? And if so why was that important? The Answer: Yes. William Sturgeon (1783-1850)…

Anna Sui

fashion designerBorn: 1955 Sui, the daughter of Chinese immigrants, grew up in Detroit, Michigan. She attended New York's Parsons School of Design, where she met renown Vogue fashion photographer…

Chemistry: What's a Mole?

What's a Mole?ChemistryThe MoleWhat's a Mole?Molar MassConverting Between Moles, Molecules, and GramsPercent Composition I'm wearing a pair of shoes right now. My question for you: How many shoes…