Lebelo la molumo ke lebelo la ho phatlalatsoa ha khatello e fokolang ea khatello e bohareng, 'me boholo ba eona bo fapana ho ea ka sebopeho le boemo ba bohareng. Lebelo la molumo moeeng le ka ba 340 m/s ho 1 khatello e tloaelehileng ea sepakapaka le 15°C.
Lebelo la ho phatlalatsoa ha leqhubu la molumo ka har'a sekhahla sa elastic ke lebelo la molumo, letšoao la lona ke c, yuniti ke m/s: c=λf
Ka foromo, f ke maqhubu a ho sisinyeha, ke hore, palo ea ho thothomela motsotsoana, Hz: λ ke bolelele ba maqhubu, m.
Hobane ha ho na elasticity ea ho kuta ka khase, ke feela molumo oa elasticity, kahoo mokhoa oa ho phatlalatsoa oa khase o ka ba maqhubu a longitudinal feela. Ka mantsoe a mang, tlas'a tšitiso ea maqhubu a molumo, likaroloana tse bohareng ba khase li sisinyeha haufi le maemo a tsona a ho lekana, 'me li etsa mokhoa o teteaneng le o fokolang oa phetisetso e latellanang. Ka nako e ts'oanang, tataiso e tsamaeang ea karoloana e tšoana le tataiso ea phatlalatso ea leqhubu. Ka kakaretso, polelo ea lebelo la molumo oa khase tlas'a maemo leha e le afe e rarahane haholo. Polelo ea eona e amana le boima ba molek'hule, matla a itseng a mocheso, le litekanyo tsa thepa ea tlhaho ea khase, 'me e ke ke ea hlahisoa mona. Mathata a akaretsang, mokhoa oa lebelo la molumo oa khase e loketseng hangata o sebelisoa.
Ho ka pakoa hore lebelo la molumo ka khase e loketseng ke: c=(rp/p) 0.5 Ka foromo, r adiabatic coefficient e lekana le karo-karolelano ea matla a mocheso ka khatello e sa khaotseng ho matla a mocheso ka khatello e sa khaotseng; p ke khatello ea khase, Pa; ρ ke tekano, kg/m3.
Lebelo la phatlalatso mecheng e fapaneng ea litaba
Vacuum 0m/s (ke hore, e ke ke ea fetisoa);
Moea (15℃) 340m/s;
Moea (25℃) 346m/s;
Cork 500m / s;
Kerosene (25℃) 1324m/s;
Metsi a hloekisitsoeng (25℃) 1497m/s;
Metsi a leoatle (25℃) 1531m/s;
Koporo (thupa) 3750m/s;
Marble 3810m/s;
Aluminium (thupa) 5000m/s;
Tšepe (thupa) 5200m/s;
