Letter M

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M Molarity (M) a unit of concentration equal to 1 mole of a substance in 1 L of solution.
MA
Molecular Absorption, Absorption of radiation by molecules. Examples of analytical methods using this property include : UV/VIS, IR, FTIR
MACT Maximum Available Control Technology
MAWP Maximum Allowable Working Pressure
MCL Maximum Concentration Limits or Maximum Contaminant Levels (SDWA)
MCLGs Maximum Contaminant Level Goals (SDWA)
MCS Multiple Chemical Sensitivity
ME Molecular Emission, emission of electromagnetic radiation by a complete molecule. Often called Fluorescence or Phosphorescence.
MECO Modern Engineering Company
MEK Methyl Ethyl Ketone
mg/m3 Milligrams per meter cubed
mil One mil equals 1/1000 of an inch
MIS Management Information Systems
MIS Master of Industrial Safety, the degree granted by the University of Minnesota (Duluth) to those who successfully complete the Master's program
ml milliliter, also mL
MMAD mass median aerodynamic diameter.
MOU Memorandum of Understanding
mppcf Million particles per cubic foot
MPRSA Marine Protection, Research and Sanctuaries Act, 16 USC Section 1431 et seq
MRP Medical Removal Protection
MS Mass Spectroscopy Identifies compounds by breaking them up into all combinations of ions and measuring mass-to-charge ratios at detector
MSA Mine Safety Appliances
MSDS Material Safety Data Sheet Provided by chemical manufacturers, required by OSHA to be available to workers
MSHA Mine Safety and Health Administration, an agency of the US Department of Labor
MTB Materials Transportation bureau of the US Department of Transportation
MTD Maximum Tolerated Dose
MTU Mobile Treatment Unit
Mutagen
an agent (as a chemical or various radiations) that tends to increase the frequency or extent of mutation (genetic damage)
MUTCD Manual for Uniform Traffic Control Devices
MVA Motor Vehicle Accident
MWA Midwest Area (of USDA ARS)

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