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assaying
assaying , in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious metals. It consists, in some cases, of subjecting the substance to complete chemical analysis and, in others, of simply determining the quantity pre...
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Geography
Geography
Geography is the study of the physical and geopolitical aspects of the surface of Earth. Physical geography describes the different surface and climatic conditions around the world. Political geography is concerned with the division of the world into various levels of government, human ...
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tracer
tracer an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the molecule it replaces and undergoes the same reactions but can at all times be detectible and quantitatively assessed. In b...
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optical activity
optical activity the ability of asymmetric compounds to rotate the orientation of planar polarized light. Such compounds and their mirror images are know as enantiomers, or optical isomers. Although differing in geometric arrangement, enantiomers possess identical chemical and physical properties. ...
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chorionic villus sampling
chorionic villus sampling (CVS) or chorionic villus biopsy (CVB) , diagnostic procedure in which a sample of chorionic villi from the developing placenta is removed from the uterus of a pregnant woman (see pregnancy ) using a fine needle inserted through the abdomen or a thin plastic catheter...
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Mars
Mars in astronomy, 4th planet from the sun, with an orbit next in order beyond that of the earth.
Physical Characteristics
Mars has a striking red appearance, and in its most favorable position for viewing, when it is opposite the sun, it is twice as bright as Sirius, the brightest star. ...
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geology
geology science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably statistics) for support of its formulations.
Branches of Geology
Geology is divided into several fields, which c...
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statistics
statistics science of collecting and classifying a group of facts according to their relative number and determining certain values that represent characteristics of the group. The most familiar statistical measure is the arithmetic mean , which is an average value for a group of numerical observa...
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dew
dew thin film of water that has condensed on the surface of objects near the ground. Dew forms when radiational cooling of these objects during the nighttime hours also cools the shallow layer of overlying air in contact with them, causing the condensation of some water vapor. This condensation o...
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market research
market research organized use of sample surveys, polls , focus groups, and other techniques to study market characteristics (e.g., ages and incomes of consumers; consumer attitudes) and improve the efficiency of sales and distribution. Development of new products, opening of new markets, measureme...
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