Lava has a relatively high viscosity; water has a relatively low one. You can measure the viscosity of a liquid by measuring the velocity of a sphere as it falls through the liquid. The velocity of the sphere, combined with the relative densities of the sphere and the liquid, can be used to calculate the viscosity of the liquid.
To calculate viscosity of a liquid, you will need a sphere, a graduated cylinder, a ruler, a stopwatch, the liquid in question, a scale, and a calculator. This experiment has many steps, but when followed correctly, they will allow you to calculate the viscosity of any liquid. The sphere can be a small marble or steel ball.
Calculate the viscosity of the fluid using the following equation, where g is acceleration due to gravity (981 [cm/s 2]). The answer should be in units of kg/cm s, or mPa-s. For comparison, the viscosity of water is approximately 1 mPa-s. For accuracy, have students repeat the experiment and calculate an average viscosity.
The kinematic viscosity can also be determined by dividing the dynamic viscosity by the fluid density. Kinematic Viscosity and Dynamic Viscosity Relationship Kinematic Viscosity = Dynamic Viscosity / Density v = ì / p Centistokes = Centipoise / Density To understand the metric units involved in this relationship it will be necessary to use an
Kinematic viscosity is the measure of the inherent resistance of a fluid to flow when no external force is exerted, except gravity. It is the ratio of the dynamic viscosity to its density, a force independent quantity. Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid ...
There are two types of viscosity: kinematic viscosity and dynamic viscosity. Kinematic viscosity measures the comparative rate at which a liquid or gas flows. Dynamic viscosity measures a gas #039;s or liquid #039;s resistance to flow as force is applied to it.
The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water.
Viscosity is first and foremost a function of material. The viscosity of water at 20 ℃ is 1.0020 millipascal seconds (which is conveniently close to one by coincidence alone). Most ordinary liquids have viscosities on the order of 1 to 1,000 mPa s, while gases have viscosities on the order of 1 to 10 μPa s.
Saybolt Universal Seconds (or SUS) is an alternative unit for measuring viscosity. The efflux time is Saybolt Universal Seconds (SUS) required for 60 milliliters of a petroleum product to flow through the calibrated orifice of a Saybolt Universal viscometer - under a carefully controlled temperature and as prescribed by test method ASTM D 88 ...