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Original file (SVG file, nominally 460 × 460 pixels, file size: 145 bytes) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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Date/Time Thumbnail Dimensions User Comment; current: 08:16, 14 February 2021: 460 × 460 (2 KB): Obsuser: upload new version so that nominal file size is same for every grey disc of the set, others are 460×460 with only this one different – 512×512
Benzene is an organic chemical compound with the molecular formula C 6 H 6.The benzene molecule is composed of six carbon atoms joined in a planar hexagonal ring with one hydrogen atom attached to each.
Amphetamine is a weak base with a pK a of 9.9; [20] consequently, when the pH is basic, more of the drug is in its lipid soluble free base form, and more is absorbed through the lipid-rich cell membranes of the gut epithelium. [20] [83] Conversely, an acidic pH means the drug is predominantly in a water-soluble cationic (salt) form, and less is ...
Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal .
Hummingbird females build a nest resembling a small cup about 1.5 inches (3.8 cm) in diameter, commonly attached to a tree branch using spider webs, lichens, moss, and loose strings of plant fibers (image). [14] [15] Typically, two pea-shaped white eggs (image) – the smallest of any bird – are incubated over 2–3 weeks in breeding season.
The current global average concentration of carbon dioxide (CO 2) in the atmosphere is 421 ppm (0.04%) as of May 2022. [ 1] This is an increase of 50% since the start of the Industrial Revolution, up from 280 ppm during the 10,000 years prior to the mid-18th century. [ 2][ 1][ 3] The increase is due to human activity.
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