Density of air

（重定向自Air density）

The movement of the helicopter rotor leads to a difference in pressure between the upper and lower blade surfaces, allowing the helicopter to fly. A consequence of the pressure change is local variation in air density, strongest in the boundary layer or at transonic speeds.

The density of air, (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity. At sea level and at 15 °C air has a density of approximately 1.225 kg/m (0.001225 g/cm, 0.0023769 slug/ft, 0.0765 lbm/ft) according to ISA (International Standard Atmosphere).

单词	Air density
释义	Air density 原声例句 Veritasium真理元素 As he continued falling into thicker atmosphere, the increasing air density reduced his terminal velocity and by two and a half kilometers above sea level, he had slowed to 200 kilometers per hour, at which point he opened his parachute. 当他继续坠入更厚的大气层时，不断增加的空气密度降低了他的终端速度，在海拔两公里半的地方，他的速度减慢至每小时 200 公里，此时他打开了降落伞。英语百科 Density of air （重定向自Air density） The density of air, (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity. At sea level and at 15 °C air has a density of approximately 1.225 kg/m (0.001225 g/cm, 0.0023769 slug/ft, 0.0765 lbm/ft) according to ISA (International Standard Atmosphere).
随便看	too development的意思 Toodflax的意思 toodleoo的意思 toodle oo的意思 toodle pip的意思 Toodles的意思 toodling的意思 toodoo的意思 Toodyay的意思 too early的意思 Tooele的意思 Tooele County的意思 tooeleite的意思 tooey的意思 Toof的意思 Toofan的意思 Too Far的意思 Too far east is west的意思 too far north的意思 Toofer的意思 too few的意思 to off的意思 too funny for words的意思 toogenerous的意思 toogh的意思