4. Classifying Matter Matter Elements Compounds Homogeneous Heterogeneous All matter has physical and chemical properties. Pure Substances Mixtures
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Notes de l'éditeur
Extensive Properties : depend upon the amount of the substance present. Examples: mass, length, volume
Intensive Properties : independent of the amount of substance present. Examples: density, color, state, melting point, boiling point, texture, conductivity, malleability, ductility
This is simply how readily the oil flows. A higher viscosity oil will withstand more heat than a lower viscosity oil. However, at colder temperatures it can actually become so thick that your starter cannot turn over the engine - and worse yet it won't flow to all the moving parts it should. A viscosity that is too low won't maintain a lubricating film on engine parts - allowing them to make metal-to-metal contact. Either extreme is very bad! The first number on a multi-grade oil indicates the "cold" viscosity of the lubricant - the second number the "hot" viscosity. For example, a SAE 10W-40 motor oil would have a viscosity rating of 10 at 0-degrees Fahrenheit (the W indicates "Winter") and a 40 rating at its maximum recommended temperature (not engine operating temperature - ambient air temperature).
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