Standard Units of Measurement

Standard Units of Measurement

• A standard unit is a commonly used unit of measurement that is standardized and fixed, ensuring uniformity in measurements.

Types of Measurement Systems

• The United States uses the U.S. Standard Measurement System or Imperial Measurement System.
• The rest of the world uses the Metric Measurement System or International System of Units (SI).

Basic Units of Measure

• Standard unit of length: inch, foot, yard, and mile in the U.S. System; millimeter, centimeter, meter, and kilometer in the Metric System.
• Standard unit of weight: ounces, pounds, and tons in the U.S. System; grams, kilograms, and tons in the Metric System.
• Standard unit of time: seconds, minutes, hours, days, weeks, years (used worldwide).
• Standard unit of volume: cups, pints, quarts, and gallons in the U.S. System; liters, milliliters, and kiloliters in the Metric System.

Metric Units of Measurement (SI)

• Established in 1875 and updated in 1921.
• The Seven SI Base Units are:
  • meter (m) for length
  • second (s) for time
  • mole (mole) for amount of substance
  • ampere (A) for electric current
  • kelvin (K) for temperature
  • candela (cd) for luminous intensity
  • kilogram (kg) for mass

U.S. Standard Units

• Used in the United States for personal or social use.
• Non-Standard Units of Measurement are units used to measure that are not internationally used as a standard.

Standard Unit of Length

• U.S. Standard System: inches, feet, yards, and miles.
• Metric System: millimeters, centimeters, meters, and kilometers.
• 1 kilometer equals 0.621 miles.

Standard Unit of Mass and Weight

• U.S. Standard System: ounces, pounds, and tons.
• Metric System: grams, kilograms, and tons.
• Mass is the amount of matter in a material, while weight is the measure of the gravitational pull on an object.
• 1 kilogram is equal to 2.2 pounds.

Standard Unit of Time

• The base unit of time is used worldwide: seconds, minutes, hours.

Standard Unit of Volume

• U.S. Standard System: cups, pints, quarts, and gallons.
• Metric System: milliliters, liters, and kiloliters.