"15W40" refers to the viscosity grade of a multi-weight oil, where 15W refers to a cold grade of 15 and 40 refers to its viscosity grade at running temperatures. The higher the viscosity grade, the thicker the oil is, which affects its lubrication ability, heat capacity and flow.
Normally, an oil's viscosity thins at a fast rate when cold and then stabilizes as the running temperature is reached. This is beneficial for cold-starting engines because it allows the oil to quickly reach critical engine components and protect them from damage. However, the oil normally becomes too thin to carry the required load and heat from the engine. Multi-weight oils solve this problem by using polymers known as VI improvers; this slows down the rate at which the oil thins and makes its viscosity at running temperatures comparable to a thicker oil.Learn More
IP44 refers to a type of lighting approved for use in some areas of the bathroom. The IP code stands for International Protection Rating, which is also called the Ingress Protection Rating.Full Answer >
According to their website, LLS refers to the Leukemia & Lymphoma Society. It is known as the world's largest voluntary agency for the treatment of blood cancer.Full Answer >
In math, the term "integer" refers to numbers that include the counting numbers, zero and the negative of counting numbers. Integers do not contain either a fractional or a decimal part.Full Answer >
"Offsides" refers to a penalty when a defensive player crosses the line of scrimmage prior to the snap of the football. Offsides can also be called on the kicking team if a player crosses the line before the kicker makes contact with the ball.Full Answer >