Gudun sauti shine saurin yaduwa na raunin damun matsa lamba a cikin matsakaici, kuma girmansa ya bambanta gwargwadon yanayi da yanayin matsakaicin. Gudun sauti a cikin iska yana da kusan 340 m/s a daidaitaccen yanayin yanayi 1 da 15°C.

 

Gudun yaduwa na igiyoyin sauti a matsakaicin na roba shine saurin sauti, alamar sa c, naúrar ita ce m/s: c=λf

A cikin dabara, f shine mitar girgiza, wato, adadin girgiza a cikin daƙiƙa, Hz: λ shine tsayin igiyoyin, m.

 

Domin babu elasticity mai ƙarfi a cikin iskar gas, ƙarar ƙarar kawai, don haka nau'in yaduwa na iskar gas ɗin zai iya zama raƙuman ruwa ne kawai. A wasu kalmomi, a ƙarƙashin hargitsi na raƙuman sauti, barbashi a cikin matsakaicin iskar gas suna girgiza kusa da matsayinsu na daidaito, suna samar da tsari mai yawa kuma maras kyau. A lokaci guda kuma, jagorar motsi na barbashi daidai yake da jagorancin yaduwa na igiyar ruwa. Gabaɗaya, yanayin saurin sautin iskar gas a kowane yanayi yana da rikitarwa sosai. Maganarsa yana da alaƙa da ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta, ƙayyadaddun ƙarfin zafi, da ma'auni na kayan jiki na gas, kuma ba za a gabatar da su a nan ba. A cikin matsalolin gaba ɗaya, ana amfani da dabarar saurin sauti na iskar gas mai kyau.

 

Ana iya tabbatar da cewa saurin sauti a cikin iskar gas mai kyau shine: c = (rp / p) 0.5 A cikin ma'auni, r adiabatic coefficient yana daidai da rabon ƙarfin zafi a matsananciyar matsa lamba zuwa ƙarfin zafi a matsa lamba; p shine matsa lamba gas, Pa; ρ yana da yawa, kg/m3.

 

Saurin yaduwa a cikin kafofin watsa labarai daban-daban

Vacuum 0m/s (wato ba za a iya watsa shi ba);

Air (15 ℃) 340m/s;

Air (25 ℃) 346m/s;

Murfin 500m/s;

Kerosene (25 ℃) 1324m/s;

Distilled ruwa (25 ℃) 1497m/s;

Ruwan Teku (25 ℃) 1531m/s;

Copper (sanda) 3750m/s;

Marmara 3810m/s;

Aluminum (sanda) 5000m/s;

Iron (sanda) 5200m/s;