Reference Material (RM) 1
Reference Material (RM) 1 : Material or substance, one or more of whose property values are sufficiently homogeneous and well established to be used for the calibration of an apparatus, the assessment of a measurement method, or for assigning values to materials [ISO Guide 30[43]]. NOTE: A reference material may be in the form of a pure or mixed gas, liquid or solid. EXAMPLES: Several kinds of reference materials exist. An internal reference material is an RM developed by a user for its own internal use. An external reference material is an RM provided by someone other than the user. A certified reference material (CRM) is an RM issued and certified by an organisation recognised as competent to do so
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