| 释义 |
standard air standard airAir having a density of 0.075 lb per cu ft (0.0012 gm per cu cm) which approximates air at 68°F (20.0°C) dry bulb and 50% relative humidity at a barometric pressure of 29.9 in. (76.0 cm) of mercury, or approximating dry air at 70°F (21.1°C) at the same pressure. |