1º_ It is a consonant that in Spanish is only used in the digraph /qu/ and always before /e/ or /i/. As a curiosity, its name 'cu' does not include the letter /q/, and is one of the few instances in the alphabet. 2º_ 'Q' represents the amino acid glutamine; the amount of heat in thermodynamics; the mathematical set of real numbers; It is also a symbol equivalent to the prefix Quetta- . 3º_ 'q' in physics represents an electric charge; It is also a symbol equivalent to the prefix quecto- .
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