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m/m means "by mass"stresses
abbr., unit.meas. m/m (It does not stand for any particular unit. 2% m/m means that the substance is 2% of the mass of the total solution http://forum.onlineconversion.com/showthread.php?t=1480 mosq)
m/m means "by: 1 phrase in 1 subject
Rhetoric1