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Near the equator, the lower edge of the stratosphere is as high as 20 km (66,000 ft; 12 mi), at mid-latitudes around 10 km (33,000 ft; 6.2 mi), and at the poles about 7 km (23,000 ft; 4.3 mi). [4] Temperatures range from an average of −51 °C (−60 °F; 220 K) near the tropopause to an average of −15 °C (5.0 °F; 260 K) near the ...
≡ 20 ft [4] = 6.096 m shaku (Japan) ≡ 10/33 m ≈ 0.303 0303 m span (H) ≡ 9 in [4] = 0.2286 m ... 1225 to 1062 km/h (761–660 mph or 661–574 kn) [note 1]
The tropospheric tabulation continues to 11,000 meters (36,089 ft), where the temperature has fallen to −56.5 °C (−69.7 °F), the pressure to 22,632 pascals (3.2825 psi), and the density to 0.3639 kilograms per cubic meter (0.02272 lb/cu ft). Between 11 km and 20 km, the temperature remains constant.
Flight levels [3] are described by a number, which is the nominal altitude, or pressure altitude, in hundreds of feet, and a multiple of 500 ft. Therefore, a pressure altitude of 32,000 ft (9,800 m) is referred to as "flight level 320". In metre altitudes the format is Flight Level xx000 metres.
62–74 km/h 17.2–20.7 m/s 18–25 ft 5.5–7.5 m Moderately high waves of greater length; edges of crests break into spindrift; foam is blown in well-marked streaks along the direction of the wind Twigs break off trees; generally impedes progress 9 Strong/severe gale 41–47 knots 47–54 mph 75–88 km/h 20.8–24.4 m/s 23–32 ft 7–10 m
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.
At its widest point the massif is 20 km (12 mi) across. ... has reduced in thickness by 150 m (490 ft). In the last 20 years the glacier has been retreating at a rate ...
After saturation, the rising air follows the moist (or wet) adiabatic lapse rate. [20] The release of latent heat is an important source of energy in the development of thunderstorms. While the dry adiabatic lapse rate is a constant 9.8 °C/km (5.4 °F per 1,000 ft, 3 °C/1,000 ft), the moist adiabatic lapse rate varies strongly with temperature.