Maximum Air Pressure. This number refers to the maximum amount of air you can put in a tire before you harm it. It is not the recommended tire pressure; that number can be found in your owner's manual and on the doorjamb. Traction Rating. A traction rating can also be found on the sidewall of all modern tires.
Reid vapor pressure. Reid vapor pressure (RVP) is a common measure of the volatility of gasoline. It is defined as the absolute vapor pressure exerted by a liquid at 37.8 Â°C (100 Â°F) as determined by the test method ASTM-D-323.
Vapor pressure means pressure exerted by the vapor of the liquid on the surface of the liquid. When liquid is cold, say water at 0Â°C at normal pressute, there will be absolutely no water vapour at its surface as all water has solidified. It will be called as low vapor pressure.