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? Abbreviations for metric units, including temperatures (Kelvin or Celsius), do not end with periods. When writing SI unit symbols, they are written in lower case except for cases where the unit is derived from a proper name, or in the very few cases where the abbreviation is not formed from a letter. 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. Metric Unit Abbreviations. An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1 ⁄ 24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.There are 60 minutes in an hour, and 24 hours in a day. Non-metric units with "per" (such as "miles per hour") usually do not take periods, either. SI unit symbol & abbreviation usage. There are 24 hours in … Hours Conversions. 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. One hour is 60 minutes. Although the kilogram is the base unit of the SI metric weight system, all units have prefixes based on the gram. 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. What does SI stand for in Science? 4.12 SI prefixes: Decimal multiples and submultiples of the SI: units, except the kilogram, are formed by attaching the names or symbols of the appropriate prefixes to the names or symbols of the units. Science SI abbreviation meaning defined here. The Web's largest and most authoritative acronyms and abbreviations resource. Get the top SI abbreviation related to Science. The hour was initially established in the ancient Near East as a variable measure of 1 ⁄ 12 of the night or daytime. Find out what is the most common shorthand of hour on Abbreviations.com! Looking for the abbreviation of hour? 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. One hour is 3,600 seconds. Abbreviations: Abbreviations such as sec, cc, or mps are avoided and only standard unit symbols, prefix symbols, unit names, and prefix names are used. 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