ENGR 1166 Chapter Notes - Chapter 7: Metrication, Metric Prefix, Systems Engineering
Chapter 7
Dimensions, Units and
Conversions
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Chapter Objectives, 1
Identify physical quantities in terms of dimensions and
units
Differentiate between fundamental and derived
dimensions
Understand the use of non-SI dimensional systems
(gravitational and absolute)
Recognize base, supplementary, and derived SI units
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Chapter Objectives, 2
Apply the appropriate SI symbols and prefixes
Describe the relationship between U.S. Customary,
Engineering System, and SI
Systematically convert units from one system to
another
Use knowledge of dimensions and units, along with
conversion rules, in the solution of engineering
problems.
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Document Summary
Identify physical quantities in terms of dimensions and units. Understand the use of non-si dimensional systems (gravitational and absolute) Systematically convert units from one system to another. Use knowledge of dimensions and units, along with conversion rules, in the solution of engineering problems. Engineers in the u. s. must be prepared for whatever system ofunits they encounter. Absolute system is based on mass (no gravity) Can be reproduced anywhere in the world (except kg) 1 radian: angle when arc length = radius radius arc length = radius. *the thermodynamic temperature (tk) expressed in kelvins is related to celsius temperature (tc) expressed in degrees celsius by the equation tc= tk- 273. 15. Some derived units have no special si unit names or symbols. Certain units outside si are accepted for use with si in the. U. s. even though they diminish the system s coherence. Plane angle degree minute second p/180 rad p/10 800 rad p/648 000 rad.
