Dimensions, Units - Introduction to Engineering - Lecture Slides, Slides for Engineering Economics. Punjab Engineering College

Engineering Economics

Description: The main points are:Dimensions, Units, Conversions, Dimensional Homogeneity, Si Unit Prefixes, Customary Units, Mass and Weight, Magnitude of Dimension, Fundamental and Derived Dimensions, History of Units, Dimensional Analysis
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Dimensions, Units, and
Conversions
Introduction to Engineering
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Objectives
Explain the difference between dimensions and
units.
Check for dimensional homogeneity.
Explain SI unit prefixes.
Convert between SI and U.S. Customary units.
Explain the difference between mass and weight.
Assignment: Handout or visit website.
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Difference Between Dimensions
and Units
Why are dimensions and units important?
Dimensions are used to describe objects
and actions. The three most basic
dimensions are length, time, and mass
Units are used to establish the size or
magnitude of a dimension. Must be based
on some convention with standards
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Difference Between Dimensions
and Units
Dimensions are divided into fundamental
and derived. Fundamental are the most
basic or elementary dimensions necessary
to describe the physical state of an object.
Derived dimensions are defined based
upon scientific and engineering equations,
and are a combination of fundamental
dimensions.
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