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In the Latin-based orthographies of many European languages, including English, a distinction between hard and soft c occurs in which c represents two distinct phonemes. The sound of a hard c often precedes the non-front vowels a , o and u , and is that of the voiceless velar stop , /k/ (as in car ).
HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.
Hard carbon is a low density material, with extremely high microporosity, while soft carbon has little microporosity. Hard carbon is extensively used as anode materials in lithium-ion batteries [4] and sodium-ion batteries. [5] [6] Manufacturers of hard carbon include Xiamen Tob New Energy (China), Kuraray (Japan) and Stora Enso (Finland).
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The origin of the terms "hard science" and "soft science" is obscure. The earliest attested use of "hard science" is found in an 1858 issue of the Journal of the Society of Arts, [17] [18] but the idea of a hierarchy of the sciences can be found earlier, in the work of the French philosopher Auguste Comte (1798‒1857).
While c , which also has hard and soft pronunciations, exists alongside k (which always indicates a hard pronunciation), g has no analogous letter or letter combination which consistently indicates a hard g sound, even though English uses j consistently for the soft g sound (the rationale for the spelling change of "gaol" to "jail").