In this chapter we have been discussing measurement.

• The mass of an item is the amount of matter it comprises. The weight of an item is the heaviness of the matter. The standard units of mass with which you should be familiar are:
  U.S.:   ounce, pound, and ton
  Metric:   gram, milligram, and kilogram

• The temperature is the degree of hotness or coolness. The standard units of temperature with which you should be familiar are: U.S.:

  Fahrenheit  (water freezes as 32°F and boils at 212°F)
  Metric:   Celsius (water freezes at 0°C and boils at 100°C)

• You should also know the metric prefixes: kilo (times 1,000); hecto (times 100); deka (times 10) deci (times 1/10); centi (times 1/100); milli (times 1/1,000)