flame-fusion method
31Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
32technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
33Helium — otherusesHelium (He) is a colorless, odorless, tasteless, non toxic, inert monatomic chemical element that heads the noble gas group in the periodic table and whose atomic number is 2. Its boiling and melting points are the lowest among the… …
34Hinduism — /hin dooh iz euhm/, n. the common religion of India, based upon the religion of the original Aryan settlers as expounded and evolved in the Vedas, the Upanishads, the Bhagavad Gita, etc., having an extremely diversified character with many… …
35hydrogen — /huy dreuh jeuhn/, n. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; at. wt.: 1.00797; at. no.: 1; density: 0.0899 g/l at 0°C and 760 mm pressure. [1785 95;… …
36coal utilization — Introduction combustion of coal or its conversion into useful solid, gaseous, and liquid products. By far the most important use of coal is in combustion, mainly to provide heat to the boilers of electric power plants. Metallurgical coke… …
37Sulfur — This article is about the chemical element. For other uses, see Sulfur (disambiguation). phosphorus ← sulfur → chlorine …
38Lithium — (pronEng|ˈlɪθiəm) is a chemical element with the symbol Li and atomic number 3. It is a soft alkali metal with a silver white color. Under standard conditions, it is the lightest metal and the least dense solid element. Like all alkali metals,… …
39Objections to evolution — Part of a series on Evolutionary Biology …
40Heavy metal — Este artículo trata sobre el género musical. Para otros usos de este término, véase Heavy metal (desambiguación). Heavy metal Orígenes musicales Hard rock Rock and roll Blues rock Rock psicodélico Rock ácido …
