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these are large sized molecules that have a ball shape when cold. upon heating they then uncoil and become longer. they are also sticky and so interact with each other.the oil fluid with these bulkier compounds is then harder to pump and therefore more viscois. this makes the resulting oil mix thicker at the higher temperature than without the viscosity index improvers. as a result a thinner base oil can be used to lubricate with the advantage of better flow at low temperatures, and in the post strartup warming cycle. this heated oil mix is thicker at higher temps than a heavier oil without viscosity index improvers, and thus can protect better. these compounds ae commonly used in multi viscosty oils.
What else can I help you with?
Name 3 oil additives and state the purpose of each?
Three oil additives include viscosity index improvers, alkaline compounds, and friction modifiers. Viscosity index improvers reduce changes at high temps, the compounds prevent acid erosion, and the modifiers form protective films on engine parts.
What Three Oil additives and purpose?
Three common oil additives are detergents, anti-wear agents, and viscosity index improvers. Detergents help keep engine parts clean by preventing sludge and deposit formation. Anti-wear agents reduce friction between metal surfaces, extending engine life by minimizing wear and tear. Viscosity index improvers enhance the oil's performance across a range of temperatures, ensuring consistent lubrication under varying conditions.
What is the difference between viscosity and viscosity index?
Viscosity is resistance to flow of oil Viscosity Index is a scale to measure viscosity
How would you define viscosity - index?
Viscosity index is a measure of how an oil's viscosity changes with temperature. Higher viscosity index oils are more resistant to changes in viscosity with temperature, making them perform more consistently across a range of temperatures.
What are the desirable properties of lubricants and how they are increased?
Desirable properties of lubricants include low viscosity, high thermal stability, good corrosion protection, and high wear resistance. These properties can be increased by using additives such as viscosity index improvers, antioxidants, antiwear additives, and corrosion inhibitors. Additionally, choosing the right base oil with the appropriate viscosity and additive package can enhance the overall performance of the lubricant.
What is the relationship between viscosity and refractive index?
There is no direct relationship between viscosity and refractive index. Viscosity relates to the resistance of a fluid to flow, while refractive index is a measure of how much light bends as it passes through a substance. However, the refractive index of a substance may change with temperature, which can in turn affect its viscosity.
How is oil viscosity index calculated?
with a calculator
What is the viscosity index of palm oil?
..5
How do you calculate the viscosity index of a petroleum product with viscosity at 40 degree centigrade and is less than 2 cst?
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What is the range viscosity index for a SAE 40?
The viscosity index (VI) for an SAE 40 oil typically ranges from 95 to 115. This index measures how much the viscosity of the oil changes with temperature; a higher VI indicates that the oil maintains its viscosity better across temperature variations. SAE 40 oils are commonly used in applications requiring high-temperature performance, such as in certain engines and industrial machinery.
What is the active ingredient for motor oil?
The active ingredient in motor oil is typically a blend of base oils and additives. The base oils, which can be derived from petroleum or synthesized, provide lubrication, while the additives enhance performance by improving viscosity, reducing friction, preventing corrosion, and minimizing oxidation. Common additives include detergents, dispersants, anti-wear agents, and viscosity index improvers. The specific formulation varies depending on the type of motor oil (e.g., conventional, synthetic, or blended).
What are viscosity modifiers for acrylic paint?
Viscosity modifiers adjust the thickness and consistency of acrylic paint. Examples of these are rheology modifiers, which are organic or inorganic coating additives that impact paint viscosity.
