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( Aspiration (phonetics))
In phonetics, aspiration is the strong burst of air that accompanies either the release or, in the case of preaspiration, the closure of some obstruents. To feel or see the difference between aspirated and unaspirated sounds, one can put a hand or a lit candle in front of his or her mouth, and say tore ([t???]) and then store ([st??]). One should either feel a puff of air or see a flicker of the candle flame with tore that one does not get with store. In most dialects of English, the t is aspirated in tore and unaspirated in store. The diacritic for aspiration in the International Phonetic Alphabet is a superscript "h", [?] . Unaspirated consonants are not normally marked explicitly, but there is a diacritic for non-aspiration in the Extensions to the IPA, the superscript equal sign, [?]. Aspirated consonants are not always followed by vowels or other voiced sounds; indeed, in Eastern Armenian, aspiration is contrastive even at the ends of words. For example compare bard?z pillow, with bart?s? difficult and bart?s? high. In many languages, such as the Chinese languages, Indo-Aryan languages (from Sanskrit), Dravidian languages (i.e. under the influence of Sanskrit. Tamil, the classical Dravidian tongue does not show aspiration at all), Icelandic, Korean, Thai, and Ancient Greek, [p? t? k?] etc. and [p? t? k?] etc. are different phonemes altogether.
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