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پنجشنبه 7 مهر 1390

نکته ای جالب در مورد درجه API ...

نویسنده: طهورا احسنی   

فکر کنم اکثر شما مثل من براتون این سوال پیش اومده باشه که چرا در فرمول API از عدد 141.5 استفاده شده؟!

اگر ادامه مطلب رو بخونید با پاسخ جالبی مواجه میشید! 

A hydrometer scale used to measure the density of petroleum, established by the American Petroleum Institute.  Symbol, °API.

When the U.S. Bureau of Standards standardized the Baumé hydrometer scale, it was “discovered that most of the hydrometers in use in the American petroleum industry had been erroneously manufactured to a modulus of 141.5 rather than 140. By 1921 this condition had become so firmly entrenched that the only seeming remedy was to recognize the scale in predominate use and rename it.”1

formula: degrees API equals 141.5 divided by G, minus 131.5

where “G” stands for the specific gravity of the liquid at 60°F in relation to water at 60°F

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