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Saybolt universal second
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Saybolt universal second : ウィキペディア英語版
Saybolt universal second
The Saybolt universal second (SUS or SSU) is a measure of kinematic viscosity used in classical mechanics. It is the time that 60 cm3 of oil takes to flow through a calibrated tube at a controlled temperature, 38°C.〔(Viscosity By Different Instruments ) Retrieved 2015-11-27〕 The SUS is used for oils with flowing time up to 5600 seconds, in the range of low to medium viscosity such as machine oils.
When the flowing time surpasses 5600 seconds, Saybolt Furol seconds (SFS or SSF) should be used instead of Saybolt universal seconds. Saybolt Furol seconds is measured with a controlled temperature of 50 degC. The tube diameter in the two scales is such that the Furol viscosity is one-tenth of the universal viscosity:
\text = \frac
Calculation of the SUS is specified by the ASTM D2161 specification.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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