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International Standard ISO 31 (Quantities and units, International Organization for Standardization, 1992) was the most widely respected style guide for the use of physical quantities and units of measurement, and formulas involving them, in scientific and educational documents worldwide. In most countries, the notations used in mathematics and science textbooks at schools and universities follow closely the guidelines given by ISO 31. It is now superseded by the harmonized ISO/IEC 80000 standard. ==Parts== The standard comes in 14 parts: *ISO 31-0: General principles *ISO 31-1: Space and time (replaced by ISO/IEC 80000-3:2007) *ISO 31-2: Periodic and related phenomena (replaced by ISO/IEC 80000-3:2007) *ISO 31-3: Mechanics (replaced by ISO/IEC 80000-4:2006) *ISO 31-4: Heat (replaced by ISO/IEC 80000-5) *ISO 31-5: Electricity and magnetism (replaced by ISO/IEC 80000-6) *ISO 31-6: Light and related electromagnetic radiations (replaced by ISO/IEC 80000-7) *ISO 31-7: Acoustics (replaced by ISO/IEC 80000-8:2007) *ISO 31-8: Physical chemistry and molecular physics (replaced by ISO/IEC 80000-9) *ISO 31-9: Atomic and nuclear physics (replaced by ISO/IEC 80000-10) *ISO 31-10: Nuclear reactions and ionizing radiations *ISO 31-11: Mathematical signs and symbols for use in the physical sciences and technology (replaced by ISO 80000-2:2009) *ISO 31-12: Characteristic numbers (replaced by ISO/IEC 80000-11) *ISO 31-13: Solid state physics (replaced by ISO/IEC 80000-12) A second international standard on quantities and units was IEC 60027 . The ISO 31 and IEC 60027 Standards were revised by the two standardization organizations in collaboration ((), ()) to integrate both standards into a joint standard ''ISO/IEC 80000 - Quantities and Units'' in which the quantities and equations used with SI are to be referred as the ''International System of Quantities'' (ISQ). ISO/IEC 80000 supersedes both ISO 31 and part of IEC 60027. 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「ISO 31」の詳細全文を読む スポンサード リンク
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