| VD | vapor density; vascular disease; vasodilation, vasodilator; venereal disease; venous dilatation; ven... |
|---|---|
| PSD | particle size distribution; peptone, starch, and dextrose; periodic synchronous discharge; phase-sen... |
| BTPS | at body temperature and ambient pressure, and saturated with water vapor [gas] |
| PH2O | partial pressure of water vapor |
| STPD | a volume of gas at standard temperature and pressure that contains no water vapor |