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In dry air, the adiabatic lapse rate (i.e., decrease in temperature of a parcel of air that rises in the atmosphere without exchanging energy with surrounding air) is 9.8 °C/km (5.4 °F per 1,000 ft). The saturated adiabatic lapse rate (SALR), or moist adiabatic lapse rate (MALR), is the decrease in temperature of a parcel of water-saturated ...
≡ 16 + 1 ⁄ 2 ft × 1 + 1 ⁄ 2 ft × 1 ft ... ≡ 1 ⁄ 32 bu (US lvl) = 1 ⁄ 4 gal (US dry) = 1.101 220 942 715 ... ≡ 1 km/h = 2. 7 ...
With a temperature lapse rate of −6.5 °C (-11.7 °F) per km (roughly −2 °C (-3.6 °F) per 1,000 ft), the table interpolates to the standard mean sea level values of 15 °C (59 °F) temperature, 101,325 pascals (14.6959 psi) (1 atm) pressure, and a density of 1.2250 kilograms per cubic meter (0.07647 lb/cu ft).
More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a sound wave is propagating.
long code "sqfoot" outputs square foot (and never feet) 1.0 sq ft (0.093 m 2) sqft m2 (sqfoot m2) square inch: sqin sq in 1.0 sq in (6.5 cm 2) sqin cm2; Other: square nautical mile: sqnmi sq nmi 1.0 sq nmi (3.4 km 2; 1.3 sq mi) dunam: dunam (none) For alternative spellings and definitions see the full list: 1.0 dunam (0.0010 km 2; 0.00039 sq mi ...
The basic assumptions made for the 1962 version were: [3] air is a clean, dry, perfect gas mixture (c p /c v = 1.40) molecular weight to 90 km of 28.9644 (C-12 scale); principal sea-level constituents are assumed to be (in mole percent):
[1] [2] Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 343.2 m/s (1,126 ft/s; 768 mph; 667.1 kn; 1,236 km/h
As another example, a regulation might limit the concentration of particulate matter to 0.1 grain per standard cubic foot (i.e., scf) of dry exhaust gas corrected to 12 volume percent CO 2. Environmental agencies in the USA often denote a standard cubic foot of dry gas as "dscf" or as "scfd".