If you are a consultant, you may get yourself listed in CSP business directory (free) or You may also find an expert in CSP business directory below. If you have questions or need any help, please contact our sponsor. Because of its ready availability, water at 20 C has been generally adopted in the United States as the primary refer ence standard, its viscosity being taken to be 0.01005 poise l.1Other values reported in the literature 2, however, are in disagreement with this value by as much as 4 parts in 1,000. Under GHS, a hydrocarbon shall be classified as aspiration toxicity hazard category 1 if its kinematic viscosity is less than 20.5mm2/s (20 cSts) at 40 ☌. Usually, increased temperature reduces the viscosity of a liquid and makes it more hazardous. Liquids with lower viscosity are generally more hazardous because they can spread more quickly. Water at 20 ☌ has a kinematic viscosity of about 1 cSt. Other units used include St and cSt.ġ cSt (centiStoke) = 1 mm2/s = 10^(?6)m2/s The SI unit of the kinematic viscosity is m2/s. The kinematic viscosity is the ratio between the dynamic viscosity and the density of a fluid. Kinematic Viscosity is a measure of the resistive flow of a fluid under the influence of gravity. You can often find it in the section 9 of a safety data sheet (SDS).ĭynamic Viscosity is a measure of a liquid’s resistance to its shearing flows, where adjacent layers move parallel to each other with different speeds. There are two types of viscosity: Dynamic viscosity and Kinematic viscosity. Viscosity is the measure of a liquid’s resistance to flow.

Viscosity of water at 20 c