Concept

Conversion of units

Summary
Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors which change the measured quantity value without changing its effects. Unit conversion is often easier within the metric or the SI than in others, due to the regular 10-base in all units and the prefixes that increase or decrease by 3 powers of 10 at a time. Overview The process of conversion depends on the specific situation and the intended purpose. This may be governed by regulation, contract, technical specifications or other published standards. Engineering judgment may include such factors as:
  • The precision and accuracy of measurement and the associated uncertainty of measurement.
  • The statistical confidence interval or tolerance interval of the initial measurement.
  • The number of significant figures of the measurement.
  • The intended use of the measurement including the engineering tolerances.
  • Historical defini
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