7. Standards of Measurement

standard

exact quantity that people agree to use to compare measurements

a number and a unit

each measurement must include

English System and Metric System

two common systems of measurement

English System

like foot, inches

Metric System

based on factors of 10 (like meter, centimeter)

International System of Units (abbreviation)

abbreviated SI

International System of Units

universally accepted and understood by scientist throughout the world

Length, Mass, Time, Temperature, Amount of substance, Electric current, Luminous intensity

7 base quantities

Length (Name)

meters (base quantity)

Mass (Name)

kilogram (base quantity)

Time (Name)

seconds (base quantity)

Temperature (Name)

Kelvin (base quantity)

Amount of substance (Name)

mole (base quantity)

Electric current (Name)

Ampere (base quantity)

Luminous Intensity (Name)

Candela (base quantity)

Length (symbol)

m (base quantity)

Mass (symbol)

kg (base quantity)

Time (symbol)

s (base quantity)

Temperature (symbol)

K (base quantity)

Amount of substance (symbol)

mol (base quantity)

Electric current (symbol)

A (base quantity)

Luminous intensity (symbol)

cd (base quantity)