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m (mouse, molality, meter)

Definition

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A lower-case m has several possible meanings on an MSDS. The most likely uses are: Mouse - this is used to indicate which kind of animal was used in toxicity testing. Usually written as a lower-case m. See an example under MSDS Relevance below. RTECS uses the abbeviation mus for mouse. Molality, a unit of concentration. While this is correctly written in lower-case italics, m, remember that plain text files do not support italics. Do not confuse this with closely-related molarity, which is capitalized M. Meter - a metric unit of distance; generally unlikely to appear on an MSDS. Do not confuse m with m3 = cubic meter, a unit of volume, which can appear as m3 in plain text files that do not support sub- and superscript characters.

MSDS Relevance

One can usually determine the intended meaning of "m" on an MSDS by looking at the context in which it is used. For example: When used with toxicity values such as an LD50, m usually refers to mouse. For example, "7,548 mg/kg (inhalation, m)" When used with respect to a solution concentration, a lower case m refers to molality. When used in reference to a distance, m usually means meters. When used in reference to a volume, m is usually written m3 or m3 for cubic meter. Further Reading Metric Information and Conversions Home Page at the National Institute of Standards. More info about the metric system, including prefixes, at ChemTeam. M - What does M stand for? at TheFreeDictionary.com Abbreviations that start with the letter: M at Abbreviations.com. See also: concentration units, distance units, RTECS, volume units Additional definitions from Google and OneLook.

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Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.