Unformatted text preview: he propagation speed of sound waves equals:
ρ E = Modulus of elasticity
ρ = Density
The modulus of elasticity of a material is determined by Hooke's law:
E= F ⋅l
A ⋅ ∆l Here, F is the force which lengthens or shortens a body of length l by length ∆l, and A
is the cross-sectional area of the body. © Festo Didactic GmbH & Co. KG • FP 1110 175 11. Physical fundamentals Speed of sound in fluids The speed of sound in fluids equals:
ρ K = Compression modulus
ρ = Density Speed of sound in gases For the speed of sound in gases the following applies:
v= κ ⋅p
= κ ⋅R ⋅ T
ρ κ = Adiabatic exponent
p = Pressure
ρ = Density
T = Temperature
R = Gas constant
The adiabatic exponent κ describes the quotient of the specific heat capacity at
constant pressure cp, and the specific heat capacity at constant volume cv.
This equation demonstrates that the speed of propagation of sound waves in gas
depends to a large extent solely on the temperature and not on the pressure of the
gas. Speed of sound in air The follo...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12