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This is an old revision of this page, as edited by 81.187.236.11 (talk) at 12:55, 28 November 2013. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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What is the history of API Gravity? How was the arbitrary scale developed?

The API standards commitee developed it around 1910(?) I wasn't able to find much historical discussion of the API gravity scale on the net. The arbitrary scale was just a formula based on specific gravity so that the values would be between 10 and 70... why 10 and 70? ... I have no clue. Best bet would be to contact the API standards committee directly or talk to someone in the petrochemical industry for more info. -- jonathan888 29Jun05

The degrees Baumé information given by Gene Nygaard allowed me to track down the history of API gravity and I added a few more pages about degrees Baumé and Antoine Baumé. -- jonathan888 26Sep05

The grades of oil shown need reference. LeadSongDog 06:51, 1 July 2007 (UTC)[reply]

Equation

Changed the equations into a proper form..Please check if there are any mistakes Yourdeadin 06:12, 19 August 2007 (UTC)Yourdeadin[reply]

Deleted the link to:

Link was broken —Preceding unsigned comment added by Kturini (talk • contribs) 19:21, 9 April 2010 (UTC)[reply]

Editing Notes

Under the "Direct Measurement of API gravity (Hydrometer method)" I wasn't sure how the first word "Thvus" should be read and/or editted. Overall very insightful article, thanks for starting it.Snapdogs1966 (talk) 13:30, 19 April 2012 (UTC)[reply]

Comment / Proposal for Update

The API has deprecated the term "specific gravity". See, for example, Manual of Petroleum Measurement Standards Chapter 11.1 (2004) section A.10[1]:

<<Quote>>

Following the convention specified in 15.2.4.8 of API Publication 2564, Second Edition[2], and with the concurrence of the Institute of Petroleum, the term “specific gravity” was discontinued. It was replaced with the term “relative density.”

<<Unquote>>

As this article relates to the API gravity, it would make sense to use API terminology. Should SG therefore be removed, and replaced by RD? 81.187.236.11 (talk) 12:55, 28 November 2013 (UTC) Mike Seabrook[reply]

  1. ^ Manual of Petroleum Measurement Standards Chapter 11.1 (2004) section A.10
  2. ^ 15.2.4.8 of API Publication 2564, Second Edition
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