Friday, 26 April 2024, 5:32 PM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
V
ViscosityThe flow rate of a liquid. The addition of solvents and/or diluents will reduce the viscosity or fluidity of the paint. Paint viscosity must be carefully adjusted and controlled to allow proper atomisation and flow-out. |
Viscosity cupA precision device used to measure the viscosity of a liquid by timing how long it takes the liquid to drain out of the cup in a continuous stream. The standard Viscosity cup in use in the UK paint industry is known as a BS B4 or DIN 4 cup, which has a 4mm orifice for the paint to flow through. |
Viscosity IndexA measure of the change in the flow rate (viscosity) of a liquid with temperature rise. The higher the viscosity index the smaller is the change in viscosity. |
Viscous CouplingA drive coupling that uses a fluid to transmit drive. Also sometimes a fluid coupling. |
VOC ContentThe measure of volatile organic compounds (VOC's) in solvent-borne paints. Usually measured as the weight in kilos of non-exempt solvent per tonne of paint. |
VolatileReadily changes to vapour or gas at ambient temperatures. |
VolatilityThe tendency of a liquid to evaporate. Liquids with high boiling points have low volatility and vice-versa. Volatility affects flash-off time and fire hazard consideration. |
VoltageElectromotive force expressed in volts. Potential difference. |
Voltage DropThe voltage that is lost when an electrical current passes through a resistance. |
Voltage RegulatorAn electrical or electronic device to maintain a generator output within a narrow voltage range. |