L2-Units_and_Dimensions

L2-Units_and_Dimensi - Material and Energy Balances UNITS AND DIMENSIONS 1 Material and Energy Balances Chapter Objectives At the end of this

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Material and Energy Balances 03/21/10 1 UNITS AND DIMENSIONS
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Material and Energy Balances 03/21/10 2 Chapter Objectives At the end of this chapter, you should be able to: Understand base units, derived units and defined units Understand dimensions Convert a quantity expressed in one set of units into its equivalent in any other dimensionally consistent units using conversion factor tables
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Material and Energy Balances 03/21/10 3 Many aren't sure of the difference. Let's try and get a set of definitions we can use. Consider 100 gram of gold 50 meters high 25 liters of kerosene
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Material and Energy Balances 03/21/10 4 Value Unit Dimension 100 gram mass 50 meter length 25 liter Volume (length 3 ) We'll break them up this way: A value is the numerical quantity. For example: 100 The units tell what that quantity represents. For example: 100 gram. The dimensions are the measurable properties that the units represent
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Material and Energy Balances 03/21/10 5 Units "Units" can be counted or measured. Measured units are specific values of dimensions defined by law or custom. Many different units can be used for a single dimension, as inches, miles, centimeters, furlongs, and meters are all units used to measure the dimension length.
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Material and Energy Balances 03/21/10 6 Dimensions A "dimension" can be measured or derived. The "fundamental dimensions" are length, time, mass, temperature Distinct and sufficient to define all the others Many derived dimensions are also used velocity, volume, density, etc. for convenience.
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03/21/10 7 Units and Calculations It is always good practice to attach units to all numbers in an engineering calculation.
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This note was uploaded on 03/20/2010 for the course IMSE tb1073 taught by Professor Musharaf during the Spring '10 term at University of Malaya.

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L2-Units_and_Dimensi - Material and Energy Balances UNITS AND DIMENSIONS 1 Material and Energy Balances Chapter Objectives At the end of this

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