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The cosmic microwave background radiation is an emission of uniform black body thermal energy coming from all directions. Intensity of the CMB is expressed in kelvin (K), the SI unit of temperature. The CMB has a thermal black body spectrum at a temperature of 2.725 48 ± 0.000 57 K. [4]
The discovery of cosmic microwave background radiation constitutes a major development in modern physical cosmology. In 1964, US physicist Arno Allan Penzias and radio-astronomer Robert Woodrow Wilson discovered the cosmic microwave background (CMB) , estimating its temperature as 3.5 K, as they experimented with the Holmdel Horn Antenna .
Chemical nomenclature, replete as it is with compounds with very complex names, is a repository for some names that may be considered unusual. A browse through the Physical Constants of Organic Compounds in the CRC Handbook of Chemistry and Physics (a fundamental resource) will reveal not just the whimsical work of chemists, but the sometimes peculiar compound names that occur as the ...
Curium bromide is an ionic compound composed of Cm 3+ and Br −, appearing as a colorless solid. It is orthorhombic, with space group Cmcm (No. 63) and lattice parameters a = 405 pm, b = 1266 pm and c = 912 pm. [ 5 ] Its crystal structure is isostructural with plutonium(III) bromide .
Amygdalin (from Ancient Greek: ἀμυγδαλή amygdalē 'almond') is a naturally occurring chemical compound found in many plants, most notably in the seeds (kernels, pips or stones) of apricots, bitter almonds, apples, peaches, cherries and plums, and in the roots of manioc.
Californium(III) bromide is an inorganic compound, a salt with a chemical formula CfBr 3. Like in californium(III) oxide (Cf 2 O 3 ) and other californium halides, including californium(III) fluoride (CfF 3 ), californium(III) chloride , and californium(III) iodide (CfI 3 ), the californium atom has an oxidation state of +3.
Nitrogen tribromide is a chemical compound with the formula NBr 3. It is extremely explosive in its pure form, even at −100 °C, and was not isolated until 1975. [ 2 ] It is a deep-red and volatile solid.
It was first discovered by Day and coworkers in 2002 as an inclusion complex containing CB[5] by fractional crystallization of the cucurbituril reaction mixture. [7] The CB[10]·CB[5] was unambiguously identified by single crystal X-ray structural analysis that revealed the complex resembled a molecular gyroscope .