It shows the cleanness of oil as available minimum particle /100 ml oil sample. size of 5 to 10 micron particle is commended as less as possible. We are using fuel in aeroplane jet engine under 5-10 micron particle available 2 or less means fuel has cleanliness class NAS 2 or less. National Aerospace Standard (NAS)
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The value of Gas Turbine Oil should be 6.
National aerospace standard
Nas, no contest.
Neither, Nas is in the 5% Nation.
NAS is Network Attached Storage, Look on Wikipedia for more.there's also a New York rapper "Nasir Jones" a.k.a. NaS.