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In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Expressed algebraically, for quantities and with , is in a golden ratio to if. φ. where the Greek letter phi ( or ) denotes the golden ratio.
Gold is the most malleable of all metals. It can be drawn into a wire of single-atom width, and then stretched considerably before it breaks. [14] Such nanowires distort via the formation, reorientation, and migration of dislocations and crystal twins without noticeable hardening. [15]
Evaluating the formula for an impact parameter, b, equal to the radius of a gold nucleus, 7 × 10 −15 m, gives the deflection angle θ as 2.56 radians (147°). Using instead the radius of a gold atom is 1.44 × 10 −10 m results in a tiny deflection angle θ of 0.0003 radians (0.02°). [55]: 109 [61]
An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat). It can refer to the cardiac atrium, [1] ventricle, [2] gall bladder, [3] or leg veins, [4] although if unspecified it usually refers to the left ventricle of the ...
The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost ...
Reflectance is a component of the response of the electronic structure of the material to the electromagnetic field of light, and is in general a function of the frequency, or wavelength, of the light, its polarization, and the angle of incidence. The dependence of reflectance on the wavelength is called a reflectance spectrum or spectral ...
The gold number is the minimum weight (in milligrams) of a protective colloid required to prevent the coagulation of 10 ml of a standard hydro gold sol when 1 ml of a 10% sodium chloride solution is added to it. [1] It was first used by Richard Adolf Zsigmondy in 1901. An electrical double layer is normally present on the gold sol particles ...
The Goldschmidt tolerance factor ( ) is a dimensionless number that is calculated from the ratio of the ionic radii: [1] rA is the radius of the A cation. rB is the radius of the B cation. rO is the radius of the anion (usually oxygen). In an ideal cubic perovskite structure, the lattice parameter (i.e., length) of the unit cell (a) can be ...
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