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ACS grade is the highest level of purity, and meets the standards set by the American Chemical Society (ACS). The official descriptions of the ACS levels of purity is documented in the Reagent Chemicals publication, issued by the ACS. [3] [4] It is suitable for food and laboratory uses. Reagent grade is almost as stringent as the ACS grade.
Reagent Chemicals [a] is a publication of the American Chemical Society (ACS) Committee on Analytical Reagents, [1] detailing standards of purity for over four hundred of the most widely used chemicals in laboratory analyses and chemical research. Chemicals that meet this standard may be sold as "ACS Reagent Grade" materials.
Below is the grading system found to be most commonly used in United States public high schools, according to the 2009 High School Transcript Study. [2] This is the most used grading system; however, there are some schools that use an edited version of the college system, which means 89.5 or above becomes an A average, 79.5 becomes a B, and so on.
APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, [1] is a color standard named for the American Public Health Association and defined by ASTM D1209. [2] It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications ...
From the 10th grade onwards, including tertiary education, a 20-point grading scale is used, with 10 passing grades and 10 failing grades, with 20 being the highest grade possible and 9.5, rounded upwards to 10, the minimum grade for passing. This 20-point system is used both for test scores and grades.
In Kenya, the grading system varies according to overall performance of candidates in the national exam called Kenya Certificate of Secondary Education (KCSE). All grade thresholds change per year according to the intensity of the exam. As of 2019 Exghest Mean Grade (A) equated to the percentage of 81+.
Some US universities also provide guidance for converting different grading systems into 4.0 scale grading. For example, UC Berkeley has a GPA Conversion chart for non-US grading systems. [4] The lower grade ranges in 0-100 scale are given higher grades than usual in 4.0 scale for Chinese grading systems.
Given that the scale of grading ranges from 0 to 100, it is common that the grade indicates the percentage of correct answers in a given exam. Grades are most often absolute and not class-specific. Thus, it may be that the top student of the class gets a low grade of 70, while the passing threshold is still 60.