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The abbreviation is not always a short form of the word used in the clue. For example: "Knight" for N (the symbol used in chess notation) Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE.
Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments. [ 1] Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis. In short, the chemical reaction in which two or more ...
Such scales are used to make the most accurate of fine measurements, such as in the needs of empirical chemistry. Avoirdupois ( / ˌævərdəˈpɔɪz, ˌævwɑːrdjuːˈpwɑː /; [ 1] abbreviated avdp.) [ 2] is a measurement system of weights that uses pounds and ounces as units. [ 3][ 4] It was first commonly used in the 13th century AD and ...
At 2 inches (5.1 cm) in diameter and 0.5 inches (13 mm) thick, both surfaces are flat to within 1/10 of the wavelength of the light (58.9 nm), as indicated by the perfectly straight fringes. An optical flat is an optical -grade piece of glass lapped and polished to be extremely flat on one or both sides, usually within a few tens of nanometres ...
The 42-year-old Today anchor was recently featured as an answer in The New York Times crossword on Sunday, Feb. 25, and her candid reaction to it couldn't have been scripted any better.
In organic chemistry, the Mannich reaction is a three-component organic reaction that involves the amino alkylation of an acidic proton next to a carbonyl (C=O) functional group by formaldehyde (H−CHO) and a primary or secondary amine (−NH 2) or ammonia (NH 3). [1] The final product is a β-amino-carbonyl compound also known as a Mannich base.
Troy ounce is a traditional unit of gold weight. One-troy-ounce (480 gr; 31 g) samples of germanium, iron, aluminium, rhenium and osmium. A Good Delivery silver bar weighing 1,000 troy ounces (83 troy pounds; 31 kg) Troy weight is a system of units of mass that originated in 15th-century Kingdom of England [ 1] and is primarily used in the ...
A SpaceX rocket has failed for the first time in nearly a decade, leaving the company’s internet satellites in an orbit so low that they're doomed to fall through the atmosphere and burn up. The ...