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The '''Saybolt universal second''' ('''SUS''' or '''SSU''') is a measure of [[kinematic viscosity]] used in [[classical mechanics]]. It is the time that 60 cm<sup>3</sup> of oil takes to flow through a calibrated tube at a controlled temperature. The SUS is used for oils with flowing time up to 5600{{Citation needed|date=June 2010}} seconds, in the range of low to medium viscosity such as machine oils. | |||
When the flowing time surpasses 5600{{Citation needed|date=June 2010}} seconds, Saybolt Furol seconds (SFS or SSF) should be used instead of Saybolt universal seconds. The tube diameter in the two scales is such that the Furol viscosity is one-tenth of the universal viscosity: | |||
<math>\text{Saybolt Furol viscosity} = \frac{\text{Saybolt universal viscosity}}{10}</math> | |||
Calculation of the SUS is specified by the [[ASTM]] D2161 specification. | |||
==External links== | |||
*[http://www.processassociates.com/process/convert/cf_vkn.htm Online viscosity convertor] | |||
*[http://www.tpub.com/content/engine/14105/css/14105_36.htm Measurement apparatus] | |||
*[http://www.engineeringtoolbox.com/dynamic-absolute-kinematic-viscosity-d_412.html Useful Saybolt reference] | |||
*[http://www.unc.edu/~rowlett/units/dictS.html About Saybolt units] | |||
[[Category:Viscosity]] | |||
[[Category:Petroleum engineering]] | |||
[[Category:Units of measurement]] | |||
{{Classicalmechanics-stub}} | |||
Latest revision as of 17:18, 15 March 2013
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. The SUS is used for oils with flowing time up to 5600Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. seconds, in the range of low to medium viscosity such as machine oils.
When the flowing time surpasses 5600Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. seconds, Saybolt Furol seconds (SFS or SSF) should be used instead of Saybolt universal seconds. The tube diameter in the two scales is such that the Furol viscosity is one-tenth of the universal viscosity:
Calculation of the SUS is specified by the ASTM D2161 specification.