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New York: The International Nickel Company, Inc., 1941: 16. — "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum. New York: D. Van Nostrand ...
There is some evidence that silicon is important to human health for their nail, hair, bone, and skin tissues, [108] for example, in studies that demonstrate that premenopausal women with higher dietary silicon intake have higher bone density, and that silicon supplementation can increase bone volume and density in patients with osteoporosis. [109]
Density (volumetric mass ... (kg/m 3) and the cgs unit of gram per cubic centimetre (g/cm 3) ... similar behavior is observed in silicon at low temperatures.
Silicon wafers were first introduced in the 1940s. ... 10 grams [18] 56 4.9 inch (125 mm) ... compared with single-crystal silicon's atomic density of 5×10 22 atoms ...
Silicon is a semiconductor with an electrical conductivity of 10 −4 S•cm −1 [287] and a band gap of about 1.11 eV. [281] When it melts, silicon becomes a reasonable metal [ 288 ] with an electrical conductivity of 1.0–1.3 × 10 4 S•cm −1 , similar to that of liquid mercury.
Aluminium, the third most common element in the Earth's crust (after oxygen and silicon), serves no function in living cells, but is toxic in large amounts, depending on its physical and chemical forms and magnitude, duration, frequency of exposure, and how it was absorbed by the human body. [38] Transferrins can bind aluminium. [39]
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%).
In semiconductors with non-simple band structures, this relationship is used to define an effective mass, known as the density of states effective mass of electrons. The name "density of states effective mass" is used since the above expression for N C is derived via the density of states for a parabolic band.