What is the difference between cp and cst

Make Shortcut to Home Screen? Privacy We don't collect information from our users. Citation This page can be cited as Engineering ToolBox, Viscosity Converting Chart. Modify access date. Viscosity Units Common units for the two primary viscosity measurement types: dynamic and kinematic. Units for Dynamic Viscosity The most commonly used unit for dynamic viscosity is the CGS unit centipoise cP , which is equivalent to 0. Table 2. Conversion between common viscosity units.

Types of Viscosity. RheoSense, Inc. VROC vs. 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. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them.

Thus, the force sensed by a molecule increases as the velocity, viscosity, or size of the molecule increases. A converting table between viscosity units like Centiposes, milliPascal, CentiStokes.

Viscosity is determined by measuring the force - or torque - needed to turn the probe. The rotational viscometer is particularly useful in measuring non-Newtonian liquids. Non-Newtonian liquids change viscosity when exposed to different conditions. For example, some of these liquids show an increase in viscosity with an increase in applied force while other non-Newtonian liquids decrease in viscosity with an increase in applied force.

The rotational viscometer can adjust the turning speed of the probe as it moves in the liquid. The viscometer detects the variation in the viscosity of the sample as the speed, sometimes call shear rate, is changed. The unit of measure for dynamic viscosity is Centipoise cP.

There are several ways to find the kinematic viscosity of a fluid, but the most common method is determining the time it takes a fluid to flow through a capillary tube. The time is converted directly to kinematic viscosity using a calibration constant provided for the specific tube. A basic difference between the dynamic and kinematic viscosity measurements is density. Density actually provides a way to convert between a kinematic and a dynamic viscosity measurement. The formula for the conversion is:.

For a given sample, with a density greater than one, dynamic viscosity will always be the higher number. You test dynamic viscosity when you want to know the internal resistance of a fluid, or the force required to move one plane of the liquid over another.

The measurement of dynamic viscosity is most useful for liquids that change their apparent characteristics as force or pressure is applied. These liquids are known as non-Newtonian fluids. Non-Newtonian fluids are sensitive to changes in the amount of force exerted on them, and can sometimes even permanently change their viscosity if a constant force has been has been exerted on them over a period of time.

An example of the importance of dynamic viscosity measurement is to indicate the proper flow characteristics of ketchup. This product needs to have lower viscosity as it flows, to get it out of the bottle, but needs to be thick or not as inclined to flow when sitting on the burger.