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After a decade of near-zero growth in methane levels, "globally averaged atmospheric methane increased by [approximately] 7 nmol/mol per year during 2007 and 2008. During the first half of 2009, globally averaged atmospheric CH 4 was [approximately] 7 nmol/mol greater than it was in 2008, suggesting that the increase will continue in 2009."
Methane (US: / ˈ m ɛ θ eɪ n / METH-ayn, UK: / ˈ m iː θ eɪ n / MEE-thayn) is a chemical compound with the chemical formula CH 4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas.
Coalbed methane (CBM or coal-bed methane), [1] coalbed gas, or coal seam gas (CSG [1]) is a form of natural gas extracted from coal beds. [2] In recent decades it has become an important source of energy in United States, Canada, Australia, and other countries. The term refers to methane absorbed into the solid matrix of the coal.
Dibenzoylmethane (DBM) is an organic compound with the formula (C 6 H 5 C(O)) 2 CH 2.DBM is the name for a 1,3-diketone, but the compound exists primarily as one of two equivalent enol tautomers. [2]
An adjective (abbreviated adj.) is a word that describes or defines a noun or noun phrase.Its semantic role is to change information given by the noun. Traditionally, adjectives are considered one of the main parts of speech of the English language, although historically they were classed together with nouns. [1]
In naturally aspirated engines powered by octane, maximum power is frequently reached at AFRs ranging from 12.5 to 13.3:1 or λ of 0.850 to 0.901. [citation needed] The air-fuel ratio of 12:1 is considered as the maximum output ratio, whereas the air-fuel ratio of 16:1 is considered as the maximum fuel economy ratio. [citation needed]
A shelf cloud along the leading edge of a derecho in Minnesota Damage caused by a derecho in Barga, Italy. A derecho (/ ˈ d ɛ r ə tʃ oʊ /, from Spanish: derecho [deˈɾetʃo], 'straight') [1] is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale ...
The derecho over Indiana on June 29. Composite radar image as the storm moved from Indiana to Virginia. The June 2012 Mid-Atlantic and Midwest derecho was one of the deadliest and most destructive fast-moving severe thunderstorm complexes in North American history.