SI Base Units Explained  -  Ch 2   Std 6

Below are common units of measure by category:

 English (USA) Metric SI base units 1 Time second second second 2 Length in , ft. , yard, mi. m, dm, cm, mm meter (m) 3 Mass oz., lb., ton g, kg, mg, μg kilogram (kg) 4 Temp. °F °C,  K K 5 Amount doz., gross, pair mole mole 6 Electric curremt ampere   (A) ampere   (A) ampere   (A) 7 Luminous intensity candela (cd) candela (cd) candela (cd)

SI Base Units (International System of Units)

The 7 SI Base Units in the last column of the chart above, are used in most scientific measurements.  From these basic 7 almost all other units of measure can be derived.  We will only use rows 1-5.  Rows 6 & 7 are used commonly in physics.

Derived Units of Measure

Derived units of measure can be base units that are squared, cubed, etc.  A few examples could be:   m2 (gives area), m3 (gives volume), cm2 , cm3 (used as definition of mL) Derived units also come from dividing or multiplying different base units together.  We will be using most of these examples during this course:

Examples:

density = which can have any of these derived units of measure and more: or or specific heat uses a derived unit of measure molar heat of fusion uses a derived unit of measure Other examples of derived units of measure are:      To print another copy of this page, go to my website and select:

Learning Center  >  Tutorials  >  Ch 2  >  SI Base Units Explained (tutorial)

There is a great website that has very complete background on SI Units, and my video explaining this tutorial at:

Learning Center  >  Web Helps  >  Ch 2  >  SI Base Units section  and  Wigger Vids section