We get Newtons formula for the speed of sound in airHence On substituting the values of atmospheric pressure and density of air at STP in equation relationwe find that the speed of sound waves in air comes out to be 280 ms -1whereas its experimental value is 332ms -1. At 20 C 68 F the speed of sound in air is about 343 metres per second 1235 kmh. K Bulk Modulus of Elasticity Pa psi r density kgm3 lbft3 This equation is valid for liquids solids and gases.
Some examples of uT p 0 for gases at T 300 K are.
The ratio of the aircrafts speed to the speed of sound affects the forces on the aircraft. K Bulk Modulus of Elasticity Pa psi r density kgm3 lbft3 This equation is valid for liquids solids and gases. To get the speed of sound temperature is important than pressure because in an ideal gas speed of sound changes with temperature. It is the square root of the product of the coefficient of adiabatic expansion and pressure of the gas divided by the density of the medium.