12 inches/1 foot		5280 feet/1 mile
1000 grams/1 kilogram		100 centimeters/1 meter

Can you name four more?

Conversion Factors Between Different Systems of Units

1 lbm/0.454 kg		1 kg/2.2 lbm
3.2808 ft/1 meter		1 m3/35.3 ft3

3.652 liters/gallon

Also see the table of conversion factors on the inside front cover of the book.

Base Unit Conversion

To convert a measured value from one base unit to another, multiply by the appropriate conversion factor as shown below:

Derived Unit Conversion

To convert a measured value from one derived unit to another, you may need to multiply by a series of conversion factors as illustrated below:

Units for Countable objects

Countable objects are articles that occur in integer numbers only. Examples include cows, cars, and people!

 

Note that countable objects may have attributes that are measurable. For example, the cows in a pasture are countable, but the mass of each cow is measurable.

2.1 cows? (no)

A mass of 312.1 kilograms? (yes)

Hint: the word countable can remind you of cows and tables (cow-n-table) (sorry about the bad pun).

Units used for countable objects include dozen (12), gross (144), and mole (6.023 x 10²³).