The vapor pressure of a liquid is the point at which equilibrium pressure is reached, in a closed container, between molecules leaving the liquid and going into the gaseous phase and molecules leaving the gaseous phase and entering the liquid phase.n explanation of vapor pressure. Vapor pressure is constant when there is an equilibrium of water molecules moving between the liquid phase and the gaseous phase, in a closed container.
When a potential problem is detected, a dashboard warning light called a malfunction indicator light (MIL) is illuminated to alert the driver. An OBD system detects a problem well before symptoms such as poor performance, high emissions or poor fuel economy are recognized by the driver.
What the key fob battery low warning light means. When the key is in use, the computer monitors the output voltage of the fobâs battery. Once the voltage gets to a certain point, the warning light will illuminate on the dash to let you know to replace the batteries. Most fobs can be pried open to access the battery so you may not have to take your car anywhere.