Non-metric units with "per" (such as "miles per hour") usually do not take periods, either. The hour was initially established in the ancient Near East as a variable measure of 1 ⁄ 12 of the night or daytime. As we will see, time isn't even the steady thing that it seems to be, but can change how quickly or slowly is passes depending on speed and mass. Hours Conversions. Science SI abbreviation meaning defined here. Metric weight units use the standard SI prefixes in the vast majority of cases, there are a couple of non-standard metric weight units, the metric ton and the carat which also have abbreviations. Temperature abbreviations are used in all types of writing. Abbreviations for metric units, including temperatures (Kelvin or Celsius), do not end with periods. The instructions just say use standard SI units but I'm not about to start expressing all the times in seconds!-MTO-QUOTE (MTO @ Sep 12 2008, 12:54 PM) Should I abbreviate hours and minutes in a microbiology paper? One hour is 3,600 seconds. Find out what is the most common shorthand of hour on Abbreviations.com! Abbreviations: Abbreviations such as sec, cc, or mps are avoided and only standard unit symbols, prefix symbols, unit names, and prefix names are used. Metric Unit Abbreviations. SI unit symbol & abbreviation usage. Looking for the abbreviation of hour? What does SI stand for in Science? The SI unit of time, the second, symbol s, is easy enough to define, but time itself can only be defined in reference to other quantities. One hour is 60 minutes. If you need to convert an hour into another unit, these conversions can help: One hour is 3,600,000 milliseconds. PWP pulmonary wedge pressure q every q2h every 2 hours qd every day qh every hour qid 4 times daily qod every other day qs quantity sufficient Q volume of blood Q ˙ flow of blood (vol./time) † Q ˙ s shunt (blood) † Q ˙ T cardiac output R, RR, resp respiratory rate Raw airway resistance RBC red blood count RLL right lower lobe RML right middle lobe RMSB right mainstem bronchus Of the seven quantities measured by the SI base units time is by far the most mysterious. The Web's largest and most authoritative acronyms and abbreviations resource. Although the kilogram is the base unit of the SI metric weight system, all units have prefixes based on the gram. Get the top SI abbreviation related to Science. If so what abbreviation is right? the name Le Systeme International d'Unites with the abbreviation SI. There are 24 hours in … The combination of the symbols for a prefix and unit is regarded as a single symbol which may be raised to a power without the use of parentheses. 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