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sound speed tondi-ye sedâ Fr.: vitesse du son The velocity of propagation of a → C is the sound velocity, dP is the change in pressure, and dρ
the change in density. It can also be expressed as C = (E/ρ),
where ^{1/2}E is the bulk modulus elasticity. This equation is valid for
liquids, solids and gases. The sound travels faster through media with higher
→ elasticity and/or lower density. If a medium is
→ incompressible the speed of sound is infinite.
For → ideal gases, a simple relationship exists between the
sound speed and temperature: C = (γR T), where γ is the
→ ^{1/2}specific heat ratio (C),
and _{P}/C_{V}R is the → gas constant. We see that for ideal
gases it the speed is independent of pressure. In air at 0°C it is 332 m/sec. The speed
of sound in a gas of hydrogen is 1315 m/s. → Mach number. |