Having such a partner would have complicated the upcoming gravity test. (sciencedaily.com)
It did so, firstly, by applying a traditional centre of gravity test. (europeanlawblog.eu)
(b) As a laboratory you must consider the primary specimen to be substituted when the creatinine concentration is less than 2 mg / dL and the specific gravity is less than or equal to 1.0010 or greater than or equal to 1.0200 on both the initial and confirmatory creatinine tests and on both the initial and confirmatory specific gravity tests on two separate aliquots. (transportation.gov)