Learn Before
Converting Between the US and Metric Systems
Because the US customary and metric systems define their units independently, converting between them requires approximate conversion factors that relate a unit from one system to a unit from the other. The most commonly used equivalences are:
Length:
- inch centimeters
- foot meters
- yard meters
- mile kilometers
- meter feet
Weight / Mass:
- pound kilograms
- kilogram pounds
- ounce grams
Capacity:
- quart liters
- fluid ounce milliliters
- liter quarts
Everyday measuring tools — such as rulers, measuring cups, and bathroom scales — often display both US and metric markings side by side, making it easy to see these equivalences in practice. The conversion procedure is the same dimensional-analysis technique used for within-system conversions: multiply the given measurement by a conversion factor that cancels the original unit and introduces the desired unit.
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Converting Between the US and Metric Systems
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A logistics coordinator is converting a shipment weight from pounds to kilograms. To ensure the actual weight of the cargo remains the same during this calculation, the conversion factor used must have a numerical value equal to ____.
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A quality assurance officer is reviewing a standard operating procedure (SOP) that requires technicians to convert measurements between different units. According to the principles of dimensional analysis, what is the defining characteristic of a conversion factor?
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Learn After
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A laboratory manager is ordering liquid reagents from an international supplier that labels its products in liters. To ensure that a 1-liter bottle of reagent will fit into the lab's existing storage bins, which are designed based on US customary quarts, the manager must recall the approximate equivalence. One liter is approximately equal to how many US quarts?
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