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PM or pm (also written P.M. or p.m.) is an abbreviation for Latin ''post meridiem'', meaning "after noon" in the 12-hour clock. PM or Pm may also refer to: ==Sciences== *Particulate matter, particulates—fine dust and soot—suspended in the air * *PM10, particulates, smaller than 10 μm, that can cause health problems *PM3 (chemistry), or Parameterized Model number 3, a modelling method in computational chemistry *Permanent magnet, an object which stays magnetised without external effort *Perpetual motion, refers to movement that goes on forever *Petameter, a length unit (1015 m) (Pm) *Phase modulation, in electrical engineering *PM tube, photomultiplier tube *Picometre, a length unit (10−12 m) (pm) *Picomolar (pM), a concentration of molecules of a chemical substance that is in scale of magnitude less than "nanomolar" & more than "femtomolar". First character lowercase (i.e. pM) *Plasma membrane, is a selectively permeable lipid bilayer found in all cells *Powdery mildew, a fungal disease that affects a wide range of plants *Powder metallurgy, a method of fabricating metals *Premolar tooth, dental nomenclature *Promethium, chemical element number 61 (Pm) *Polymyositis, disease *Post mortem, a medical examination carried out after death *''Principia Mathematica'', a three-volume work on the foundations of mathematics *Polarization-maintaining optical fiber *Participatory medicine, a new model of medicine 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PM」の詳細全文を読む スポンサード リンク
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