73 Feet per Deg. The higher you get, the colder it gets, up until 40,000 feet. Has anyone seen comedian Eddie Izzard's Glorious, where he does a sketch about taking a flight in a very small aircraft with only a handful of passengers? 0.011 Discover world-changing science. Note that because we consider air as the ideal gas, and only dry air, the result of calculations is only an approximation. Engineering Physics Speed of Sound table chart including Speed of Sound at a known temperature and density of air, Speed of Sound vs Density of Air . Convert your 1L figure to mL.