If an incorrect (or approximate) conversion factor is used, a correct solution will not be achieved.You can do the reverse unit conversion from Remember that Step 3, identifying the conversion factor, is often the most challenging step. However, multiple factors may be required to solve a problem. Many unit conversion problems will require only a single unit conversion factor. Only round the final calculated quantity.Do not round any quantities used within the calculation.Documenting the calculation steps can be especially helpful when problem-solving errors. Multiply the numerators (across) and denominators (across) to calculate an intermediate answer, then divide.Does the answer make sense? Best Practices Cancel units and perform the math calculations (e.g., multiply, divide). Use EXACT conversion factors whenever available. ![]() These are the Linking (or Ratio) Unit(s). Identify appropriate unit conversion factor(s). Use these steps to construct a unit conversion problem so one (or more) of the units cancel until only the desired unit remains: It may be necessary to multiply by more than one conversion ratio in more complex conversions. It’s very easy to systematically apply unit conversion process to solve conversions within or between measurement systems. While the multiplication by 1 does not change the value of the measurement, it does change the measurement units. This allows the conversion of units by multiplying the initial measurement by one (or more) forms of the number 1. This process uses the fact that any number or expression can be multiplied by "one" without changing its value. Performing the math calculation (3 divided by 4) transforms the number into a decimal fraction, 0.75. In this example of the common fraction ¾, 3 is the numerator and 4 is the denominator. A denominator represents the total number of parts of the whole. A conversion ratio (or unit factor) always equals one (1), where the numerator and the denominator have the same value expressed in different units.Ī numerator represents the parts out of the whole or how much you have. A conversion factor is an expression for the relationship between units that is used to change the units of a measured quantity without changing the value. This problem-solving method is based on the principle that quantities are defined as equalities. Converting between measurement units is a very important skill when working within and between measurement systems. A square shape (area) has two dimensions (e.g., length and width), while a cube (volume) has three dimensions (e.g., length, width, and height). Some measurements have one dimension, for example length. For example, changing the magnitude of a SI quantity or converting between SI and non-SI units. Pressure and Gas Flow Conversion Informationĭimensional analysis is a technique used to convert measurements.NIST HB 133 Appendix E (Current Ed.) provides unit conversion factor tables for the benefit of those requiring an reference when checking the net contents of packaged goods. ![]() customary units, including notes on British measurement units.
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