Speed of Sound

**Speed of Sound** kan jedhamu kuni *speed* *sound wave*iin  wanna yokan (medium) Elastic ta'e kessa demuni. Gossa wanna kessa darbu irratti hunda'e *speed* kuni gargara jirra (Fakkena *sound wave*iin qillensa kessa calla bishanii kessa bayye faggo demma). Kana qoffa osoo hin ta'in garagarruman kuni fakki *medium* sunni irrattille ni hunda'a (fakkena Temprature). Maqqan kuni bayyinan *sound wave* qillensaffi fayyadatama. *Sea Level*itti, temprature 21°C (70 °F) fi atmosferra sirritti (normalitti) *speed* kuni  344 m/s (769 mph or 1238 km/h) dha.

Maqaan **sound velocity**(v) fi **sound speed**(c) kan yerro guddo walli wajjin fayyadamani maqaa Sound Particle Velocity(v) wajjin gargarri bafachunni barbachissa dha. Sound particle velocityiin *velocity particle*(yokan *velocity* wantotta diddiqo waan adunya hundaa kessatti argamanitti).

Gossa atmosferra irratti hunda'e *speed* kuni gargarri jirra. Kan kessa immo kan bayye *speed* jijjiru *tempraturadha*. Dhibaan qillensa *speed* *soundii* irratti jijjirama homma hiin fiddu. Ideal gas irratti dhibaan qillensa jijjirama homma fidu hin danda'u. Kunis sababa dhibaan kunif *density*iin qillensa jijjirama wal-qixxe ta'e waan fidanuffi. Kanaffu *ideal gas* kessatti *density* fi *dhiban* walli ballessu. Kunni immo jijjirami sababa *tempraturra* qofaan akka dhufu sababa ta'a. Tempraturra gudda kessatti *speed of sound*iin gudda dha. Fagganne gara olii yoo demnu *speed of sound*iin hirdhacha dhuffa kunis sababa yoo ollii demnu tempraturii waan hirdhacha dhufuffi. Haa ta'u malee olii demne yoo Stratosphere dhaqabnu temprecherii ni darrata kunis sababa ho'a Ozone Layeriif, kanafu *speed of sound*illen ni darratta. 

Jidhii (Humidity)iin jijjirami *speed of sound* irratti qabu diqqa haa ta'u malee lakka'amu ni danda'a. *Speed of sound*iin qillensa jidha kessatti percentii 0.1%-0.6% hirdhatta.

Tilmammi *speed of sound*ii halla qillensa jidha hinqabne fi temprecherri 0 °Cfi dhihoo ta'e kessatti meters per second (m·s-1)iin *formula* kanan argamu ni danda'amma.
                        :
c_{\mathrm{air}} = 331{.}3 + (0{.}6 \cdot \vartheta) \ \mathrm{m \cdot s^{-1}}\,

where \vartheta\,  is the temperature in degrees Celsius (°C).

*Formula*n kuni kan dhufee *formula* Taylor Expansion term lamman dura irratti. *Formula*n Taylor immo kan fakkatta:-
            :c_{\mathrm{air}} = 331.3 \sqrt{1+\frac{\vartheta}{273.15}}\ \mathrm{m \cdot s^{-1}}

Lakkofsii 331.3 m/s kuni *speed* temprature 0 °C yoo ta'u, lakkofsi kuni guddinan *theory*iin kan argame fi hanga ta'een immo lakka'amme argame yoo ta'u kan itti hunda'e immo specific heat ratio,\gamma. Yoo *ideal gas*iin \gamma tilmamee 7/5 = 1.4000 ta'a jedhame, speed temprecheraa 0 °C argammu 331.3 m/sec ta'a (lakkofsi kuni immo lakkofsa formula irratti fayyadame dha). Haa ta'u malle speed temprature 0 °C kan *ideal gas* hunda 331.2 hanga 331.6 ta'a.

*Formula*n kuni *range* temprecherra  bayye kessatti ni hojjatta, haa ta'u malle Heat Capacityiin kuni akka temprecherra irra ofii danda'etti yoo fudhatame. *Formula*n kuni immo temprecherra guggudatti hin hojjattu. Haa ta'u malle *formula*n kuni tilmamma garri kan kennu yerro qillensi goggoga, qabana'a fi dhibaa qillensa diqaa qabattu dha. Fakkenafi Stratospheretti.