Thermodynamics Notes2

Thermodynamics Notes2 - ME 311 FALL 2007 UNIT SYSTEMS...

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ME 311 THERMODYNAMICS S. Masutani FALL 2007 UNIT SYSTEMS The textbook employs two systems: SI and English engineering system This is rather tedious, but probably will continue for a good portion of your careers. Before examining the differences in the SI and English systems, we need to establish the terminology that will be used and provide some definitions. Terminology a. Dimension–a quantity which can be assigned a numerical value; related to abstract spaces, position in which describes the condition of a system under study. Examples (from mechanics): length, time, velocity, mass b. Primary dimension or quantity–those dimensions for which arbitrary scales of measure are established; forms basis of a particular dimensional system. c. Secondary dimensions or quantities–expressed in terms of primary quantities. For example, SI selects length, time, and mass as primary dimensions (MLT); all others are secondary quantities. Unit standards are established for primary dimensions. M: kg (defined relative to a special Platinum-Iridium cylinder); L: m (defined relative to a number of wavelengths of atomic line); T: s (defined relative to a number of cycles of Ce transition; note that ν h E = Δ ). In SI, force is a secondary quantity; the SI unit force is determined from Newton’s Second Law:
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Thermodynamics Notes2 - ME 311 FALL 2007 UNIT SYSTEMS...

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