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2. Speed of sound - Wikipedia

   en.wikipedia.org/wiki/Speed_of_sound

   Air, a mixture of oxygen and nitrogen, constitutes a non-dispersive medium. However, air does contain a small amount of CO 2 which is a dispersive medium, and causes dispersion to air at ultrasonic frequencies (greater than 28 kHz). [8] In a dispersive medium, the speed of sound is a function of sound frequency, through the dispersion relation.

3. Density of air - Wikipedia

   en.wikipedia.org/wiki/Density_of_air

   At 20 °C and 101.325 kPa, dry air has a density of 1.2041 kg/m 3. At 70 °F and 14.696 psi, dry air has a density of 0.074887 lb/ft 3. The following table illustrates the air density–temperature relationship at 1 atm or 101.325 kPa: [citation needed]

4. Northrop B-2 Spirit - Wikipedia

   en.wikipedia.org/wiki/Northrop_B-2_Spirit

   B-2 Spirit A U.S. Air Force B-2 Spirit flying over the Pacific Ocean in 2016 General information Type Stealth strategic heavy bomber National origin United States Manufacturer Northrop Corporation Northrop Grumman Status In service Primary user United States Air Force Number built 21 History Manufactured 1987–2000 Introduction date 1 January 1997 First flight 17 July 1989 ; 35 years ago ...