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Quartz sand (silica) as main raw material for commercial glass production. Silica ingested orally is essentially nontoxic, with an LD 50 of 5000 mg/kg (5 g/kg). [22] A 2008 study following subjects for 15 years found that higher levels of silica in water appeared to decrease the risk of dementia. An increase of 10 mg/day of silica in drinking ...
The contribution of the muscle to the specific heat of the body is approximately 47%, and the contribution of the fat and skin is approximately 24%. The specific heat of tissues range from ~0.7 kJ · kg−1 · °C−1 for tooth (enamel) to 4.2 kJ · kg−1 · °C−1 for eye (sclera). [13]
Fumed silica (CAS number 7631-86-9, also 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density ...
Dry Density= 1200 kg ⋅ meter −3 20% Saturation: K= 0.90 W ⋅ m −1 ⋅ K −1 40% Saturation: K= 1.05 60% Saturation: K= 1.15 80% Saturation: K= 1.20 Dry Density= 1400 kg ⋅ meter −3 20% Saturation: K= 1.09 40% Saturation: K= 1.30 60% Saturation: K= 1.44 80% Saturation: K= 1.54 Dry Density= 1600 kg ⋅ meter −3 20% Saturation: K= 1.29
— "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 .
The density of glass varies with chemical composition with values ranging from 2.2 grams per cubic centimetre (2,200 kg/m 3) for fused silica to 7.2 grams per cubic centimetre (7,200 kg/m 3) for dense flint glass. [69]