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How to Make Metric Conversions for Chemistry

Metric conversions are commonplace in sciences such as chemistry and physics. As many countries have not yet fully adopted the metric system, it is often necessary to convert between metric quantities and other systems of measure. This process is first taught in introductory science courses such as general chemistry and physics. The process of converting between measurement systems is known as dimensional analysis. This process uses comparative ratios known as conversion factors to aid in the transition between measurement systems.

Instructions

    • 1

      Create a conversion factor that relates an equality between the starting unit type and the desired metric unit. For example, 1 gallon / 3.785 liters.

    • 2

      Invert the fraction, as necessary, to ensure that the unit type you wish to end with is in the numerator. In the example, 1 gallon / 3.785 liters must be inverted to 3.785 liters / 1 gallon if the ending unit of liters is desired.

    • 3

      Multiply the quantity of the starting unit by the conversion factor and simplify. For example, if converting 7 gallons into liters, you would calculate 7 gallons * 3.785 liters / 1 gallon = 26.495 liters. The gallon unit appears in both the numerator and denominator and is therefore canceled.

    • 4

      Multiply the result in Step 4 by 1,000 to express your volume in milliliters. In the example, you would obtain 26,495 milliliters.

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