ME 1201 Chapter 8 Dimensions, Units, and Conversions
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18 Terms
Dimensions
Physical quantities that can be measured
Units
Choice made to quantify a dimensiom
Conversions
All units for the same dimensions related to each other through a conversion factor
Base dimensions
Basic or fundamental primary dimensions
Absolute system (base dimension)
Based on mass- no gravity
Gravitational system (base system)
Based on force
Derived dimensions (secondary dimensions)
Obtained or derived from base dimensions
Base Dimensions-Absolute Systems
Length, time, mass, temperature, electric current, amount of substance, light intensity
Base Dimensions- Gravitational Systems
Length, time, force, temperature, electric current, amount of substance, light intensity
When mass is a base dimension,
Force is a derived dimension
When force is a base dimension,
Mass is a derived dimension
Units are used to
quantify a dimension
Base units have
Base dimensions
Derived units have
Derived dimensions
International System of Units (SI)
Mass is a base dimensiom
United States Customary System of Units (USCS)
Force is a base dimension
SI base units
Length, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity
USCS fundamental units
Length, time, force
