- What is the SI unit of poise?
- How is viscosity calculated?
- What is surface tension in simple words?
- What is Viscosity Index formula?
- What causes viscosity?
- What is a good example of viscosity?
- What is difference between density and viscosity?
- What is viscosity and its SI unit?
- What is the SI unit of viscosity and surface tension?
- What are the types of viscosity?
- What is SI unit of surface energy?
- What is surface tension and its unit?
- What is a simple definition of viscosity?
What is the SI unit of poise?
Poise (P) – dynamic viscosity of fluids, commonly expressed as cP (centipoise) – Jean Louis Marie Poiseuille in the 1838 – 1846, derived during his studies on blood flow.
The poise is often used with the metric prefix centi-.
A centipoise is one millipascal-second (mPa·s) in SI units (1 cP = 10-2P = 10-3 Pa·s)..
How is viscosity calculated?
There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v), where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.
What is surface tension in simple words?
Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.
What is Viscosity Index formula?
For Oils of 100 VI and greater U = antilog [log H – N log Y] where Y = kinematic viscosity of oil in centistokes at 100°C. L = kinematic viscosity in centistokes at 40°C of an oil of 0 viscosity index and having the same kinematic viscosity at 100°C as the oil whose viscosity index is to be calculated.
What causes viscosity?
Viscosity is caused by friction within a fluid. It is the result of intermolecular forces between particles within a fluid.
What is a good example of viscosity?
Some liquids, like pitch, glass and peanut butter, have such high viscosity they behave like solids. Viscosity varies with temperature and pressure. It is usually expressed, particularly in ASTM standards, as centipoise (cPs). For example, water at 20°C has a viscosity of 1.002 cPs.
What is difference between density and viscosity?
In fluid dynamics, viscosity is the parameter to measure the thickness or thinness of any given fluid. Density is the measure of spaces between two particles in a given fluid. Viscosity and density are the characteristics of a fluid, but there is no direct relation between viscosity and density.
What is viscosity and its SI unit?
Units. The SI unit of dynamic viscosity is the newton-second per square meter (N·s/m2), also frequently expressed in the equivalent forms pascal-second (Pa·s) and kilogram per meter per second (kg·m−1·s−1).
What is the SI unit of viscosity and surface tension?
States of Matter SI unit of surface tension is Nm–1. SI unit of coefficient of viscosity is kg m-1 s-1.
What are the types of viscosity?
There are two kinds of viscosity commonly reported, kinematic and dynamic. Dynamic viscosity is the relationship between the shear stress and the shear rate in a fluid. The Kinematic viscosity is the relationship between viscous and inertial forces in a fluid.
What is SI unit of surface energy?
Description. • Surface energy density has the dimension mass per time squared. The SI composite unit of surface energy density is the joule per square meter.
What is surface tension and its unit?
Newton per metreSurface tension/SI units
What is a simple definition of viscosity?
Viscosity is a measure of a fluid’s resistance to flow. A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion.