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[". 4℃에서의 값으로 기름의 비ISCO도를 표시하는 이유는 무엇인가요?

2017-12-21View Original

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4℃ 또는 4℃에서의 값으로 기름의 비ISCO도를 표시하는 이유는 무엇인가요?
Reply #22017-12-21
由于润滑油的粘度会随温度变化:温度升高,润滑油粘度降低(变稀),温度降低,粘度增加(变稠),因此在制定ISO粘度级别时,充分考虑了工业应用的各因素,把40℃测定的运动粘度(kinematic viscosity)作为ISO粘度的基准。这个是国际标准。就跟长度单位m一样,为什么就那么长是1m一样,假如原先定义现在的10m的长度是1m,那现在的1m就是0.1m了。这就是为什么要统一度量衡一样。
Reply #32017-12-28
本人认为并非如此,期待更好的回答。。。

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