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History Polystyrene was discovered in 1839 by Eduard Simon, an apothecary in Berlin. From storax, the resin of the Turkish sweetgum tree (Liquidambar orientalis), he distilled an oily substance, a monomer which he named styrol. Several days later, Simon found that the styrol had thickened, presumably from oxidation, into a jelly he dubbed styrol oxide […]

Common diving breathing gases Common diving breathing gases are: Air is a mixture of 21% oxygen, 78% nitrogen, and approximately 1% other trace gases; to simplify calculations this last 1% is usually treated as if it were nitrogen. Being cheap and simple to use, it is the most common diving gas. As its nitrogen component […]

Top Recommended: "Dumex milk powder caused by stones," the latest reported incident Just quell the poison milk incident, a few days ago due to foreign media reports of the hiccups have risen again, Zhejiang and other places 48 drinking Dumex infant formula after infant symptoms of kidney stones, milk powder suspected of being contaminated. Dumex […]

Parts of a typical globe valve Globe valve Body The body is the main pressure containing structure of the valve and the most but easily identified as it forms the mass of the valve. It contains all of the valve’s internal parts that will come in contact with the substance being controlled by the valve. […]

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2006) The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is […]