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The density of air or atmospheric density, denoted ρ, [1] is the mass per unit volume of Earth's atmosphere.Air density, like air pressure, decreases with increasing altitude.
Being hydrophobic, chlordane adheres to soil particles and enters groundwater only slowly, owing to its low solubility (0.009 ppm). It requires many years to degrade. [16] Chlordane bioaccumulates in animals. [17] It is highly toxic to fish, with an LD 50 of 0.022–0.095 mg/kg (oral).
After identification of the 14 C residues in organs of the goats, such as the liver, heart, kidneys, muscles and fat tissue, it appeared that 0.03 ppm or less of the 14 C compounds present was non-metabolized ethion. The metabolites ethion monoxon and ethion dioxon were also not detected in any samples with a substantial threshold (0.005-0.01 ppm).
The sharp acceleration in CO 2 emissions since 2000 to more than a 3% increase per year (more than 2 ppm per year) from 1.1% per year during the 1990s is attributable to the lapse of formerly declining trends in carbon intensity of both developing and developed nations. China was responsible for most of global growth in emissions during this ...
In crude oil, concentrations up to 1200 ppm have been reported. When such oil products are burned, traces of vanadium may cause corrosion in engines and boilers. [65] An estimated 110,000 tons of vanadium per year are released into the atmosphere by burning fossil fuels. [66] Black shales are also a potential source of vanadium.
Bacterial Filtration Efficiency or BFE is a measurement of a respirator material's resistance to penetration of bacteria.Results are reported as percent efficiency and correlate with the ability of the fabric to resist bacterial penetration.
The 1 H and 13 C NMR chemical shifts are respectively 1.873 and 1.756 ppm and are 28.46 and 37.85 ppm. [28] The simplicity of these spectra is consistent with high molecular symmetry. Mass spectra of adamantane and its derivatives are rather characteristic. The main peak at m/z = 136 corresponds to the C 10 H + 16 ion.
The best known approximations to π dating to before the Common Era were accurate to two decimal places; this was improved upon in Chinese mathematics in particular by the mid-first millennium, to an accuracy of seven decimal places.