Units and Conversion Factors

Units of Length

Metric System

  • meter (m) = 39.37 inches (in.) = 1.094 yards (yd)
  • centimeter (cm) = 0.01 m (exact, definition)
  • millimeter (mm) = 0.001 m (exact, definition)
  • kilometer (km) = 1000 m (exact, definition)

US System

  • inch (in.) = 2.54 cm (exact, definition)
  • yard (yd) = 0.9144 m
  • mile (US) = 1.60934 km

Units of Volume

Metric System

  • liter (L) = 0.001 m3 (exact, definition) = 1000 cm3 (exact, definition) = 1.057 (US) quarts
  • milliliter (mL) = 0.001 L (exact, definition) = 1 cm3 (exact, definition)
  • microliter [latex](\mu\text{L})[/latex] = 10–6 L (exact, definition) = 10–3 cm3 (exact, definition)

US System

  • liquid quart (US) = 32 (US) liquid ounces (exact, definition) = 0.25 (US) gallon (exact, definition) = 0.9463 L
  • dry quart = 1.1012 L
  • cubic foot (US) = 28.316 L

Units of Mass

Metric System

  • gram (g) = 0.001 kg (exact, definition)
  • milligram (mg) = 0.001 g (exact, definition)
  • kilogram (kg) = 1000 g (exact, definition) = 2.205 lb
  • ton (metric) =1000 kg (exact, definition) = 2204.62 lb

US System

  • ounce (oz) (avoirdupois) = 28.35 g
  • pound (lb) (avoirdupois) = 0.4535924 kg
  • ton (short) =2000 lb (exact, definition) = 907.185 kg
  • ton (long) = 2240 lb (exact, definition) = 1.016 metric ton

Check Your Understanding

Answer the question(s) below to see how well you understand the topics covered in the previous section. This short quiz does not count toward your grade in the class, and you can retake it an unlimited number of times.

Use this quiz to check your understanding and decide whether to (1) study the previous section further or (2) move on to the next section.