Kacepetan swara iku istilah kang dipigunakaké kanggo nyebut kacepetan gelombang swara kang ngliwati medium elastis. Kacepwtan iki bisa béda-béya gumantung marang medium kang diliwati (upamané swara luwih rikat ngliwati udara tinimbang banyu), sipat-sipat medium mau, lan suhu. Nanging, istilah iki luwih akèh dianggo tumrap kacepetan swara ing udara. Ana ing salumahing sagara, kanthi suhu 21 °C lan kondisi atmosfer normal, kacepetan swara ya iku 344 m/detik (1238 km/jam).
Cithakan:Ékan kacepetan
Cithakan:Ékan-stub
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