Helikiirusel on nõrk sõltuvus sagedusest ja rõhust tavalises õhus, kaldudes veidi kõrvale ideaalsest käitumisest, mistõttu kõnekeeles viitab heli kiirus helilainete kiirusele õhus.
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Üldiselt helikiirus on aga aineti erinev: tavaliselt liigub heli kõige aeglasemalt gaasides, kiiremini vedelikes ja kõige kiiremini tahketes ainetes, näiteks on helikiirus merepinna kõrgusel rahvusvahelises standardatmosfääris 1 215 km/h.
The speed of sond has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior, as a result of which in colloquial speech, speed of sound refers to the speed of sound waves in air.
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However, the speed of sound varies from substance to substance: typically, sound travels most slowly in gases, faster in liquids, and fastest in solids.
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