Allophone - Wikipedia
https://en.wikipedia.org/wiki/Allophone
There are many allophonic processes in English: lack of plosion, nasal plosion, partial devoicing of sonorants, complete devoicing of sonorants, partial devoicing of obstruents, lengthening and shortening vowels, and retraction. • Aspiration: In English, a voiceless plosive /p, t, k/ is aspirated (has a strong explosion of breath) if it is at the beginning of the first or a stressed syllable in a word. For example, [pʰ] as in pin and […
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