ASTM D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants
kinematic viscosity, n - the ratio of the viscosity to the density of a liquid.
DISCUSSION - Kinematic viscosity is a measure of the resistance to flow of a liquid under gravity.
kinematic viscosity, n - the ratio of the viscosity to the density of a liquid. It is a measure of the resistance of flow of a liquid under gravity. In the SI, the unit of kinematic viscosity is the metre squared per second; for practical use, a submultiple (millimetre squared per second) is more convenient. The centistoke (cSt) is 1 mm2/s and is often used.
kinematic viscosity, n - a measure of the resistance to flow of a fluid under gravity.
kinematic viscosity (v), n - the ratio of the dynamic viscosity (η) to the density (ρ) of a liquid.
DISCUSSION - For gravity flow under a given hydrostatic head, the pressure head of a liquid is proportional to its density (ρ). Therefore the kinematic viscosity (v) is a measure of the resistance to flow of a liquid under gravity.
kinetic coefficient of friction, n - the coefficient of friction under conditions of macroscopic relative motion between two bodies.
kinetic friction, n - the force that resists motion when a surface is moving with a uniform velocity; it is, therefore, equal and opposite to the force required to maintain sliding of the surface with uniform velocity.
knock, n - in a spark ignition engine, abnormal combustion, often producing audible sound, caused by autoignition of the air/fuel mixture.
knock, n - in an aircraft spark-ignition engine, abnormal combustion caused by autoignition of the air/fuel mixture.
knock condition, n - for octane rating, when the knock intensity in any cylinder is light knock or greater as described in Annex A1.
knock intensity, n - for knock testing, a measure of the level of knock.
knock-limited power curve, n - for supercharge method knock rating, the non-linear standard knock intensity characteristic of a primary reference fuel blend or a sample fuel, expressed as indicated mean effective pressures, over the range of fuel-air ratios from approximately 0.08 to approximately 0.12.
knock number, n - for octane rating, a numerical quantification of knock intensity.
knockmeter, n - for knock testing, the 0 to 100 division indicating meter that displays the knock intensity signal from the detonation meter.
