What does mm2 s mean?
kinematic viscosity
The SI unit of kinematic viscosity is the square metre per second, m2/s. The normal sub- unit derived from this is the square millimetre per second, mm2/s = 10-6 m2/s. (1 mm2/s = 1 centistoke [cSt] in the obsolete cgs-system.)
Is mm2 s same as cSt?
mm2/s↔cSt 1 mm2/s = 1 cSt.
What is a centistoke equal to?
A centistokes (cSt) is a decimal fraction of the CGS unit of kinematic viscosity stokes, which is equal to centimeter per second (cm²/s). 1 stokes is a kinematic viscosity of a fluid with a density of 1 g/cm³ and a dynamic viscosity of 1 poise.
What is viscosity index improver?
A viscosity index improver is a complex polymer additive that expands at elevated temperatures to thicken the lubricant and ensure a more stable and consistent viscosity. This ensures the lubricant fully protects the equipment at both low and high temperatures.
Is oil viscous or less viscous?
Thin oils have lower viscosity and pour more easily at low temperatures than thicker oils that have a higher viscosity. Thin oils reduce friction in engines and help engines start quickly during cold weather. Thick oils are better at maintaining film strength and oil pressure at high temperatures and loads.
How do you convert viscosity to kinematic viscosity?
Density actually provides a way to convert between a kinematic and a dynamic viscosity measurement. The formula for the conversion is: Kinematic (cSt) x Density = Dynamic (cP) Dynamic (cP) / Density = Kinematic (cSt)
What is mPa’s viscosity?
The measurement unit of viscosity is Pa·s (pascal second) or mPa·s (millipascal second). As viscosity value increases, the force due to viscosity increases as well. In addition, cP (centipoise) is the conventional measurement unit.
What is low viscosity?
Fluids with low viscosity have a low resistance and shear easily and the molecules flow quickly; high viscosity fluids move sluggishly and resist deformation. Some liquids, like pitch, glass and peanut butter, have such high viscosity they behave like solids. Viscosity varies with temperature and pressure.
How do you find the viscosity of a centistoke?
1 centistokes = 1 mm2•s-1 = 10-6m2•s-1. The kinematic viscosity can also be called diffusivity of momentum since it has the same dimensions as the diffusivity of heat and diffusivity of mass concentration. The transport of momentum is analogous to the transport of other properties of a fluid.
Is higher viscosity oil better?
Thin, low viscosity oils flow easier to protect engine parts at cold temperature. Thick, high viscosity oils are typically better at maintaining film strength to protect engines at high temperatures.
What are dispersants in engine oil?
Dispersants are lubricant additives that help prevent sludge, varnish and other deposits from forming on critical surfaces. They are primarily used in gasoline engine and heavy-duty diesel engine oils, which account for 75 to 80 percent of their total use.
How many millimeters of viscosity per second?
This classification defines 20 viscosity grades in the range of 2 to 3200 square millimeters per second (1 mm2/s = equals 1 cSt) at 40ºC (104ºF).
What kind of unit does ISO use for viscosity?
ISO (International Standards Organisation) viscosity classification. The ISO viscosity classification uses mm2/s (cSt) units and relates to viscosity at 40oC.
Which is the metric unit of kinematic viscosity?
A square millimeter per second (mm²/s) is a metric unit of kinematic viscosity.
How is the viscosity of oil measured and reported?
The viscosity is typically reported in centistokes (cSt), equivalent to mm2/s in SI units, and is calculated from the time it takes oil to flow from the starting point to the stopping point using a calibration constant supplied for each tube.