1. Derived units Derived units- A combination of other units
Example : Speed, Volume, and Density
Speed is measured as m/s in SI units
Volume is the measure of space
Volume is expressed as cubic meter, cubic centimeter or cubic millimeter - m3 ,cm3 ,or mm3

2. VOLUME VOLUME OF A CUBE = (EDGE LENGTH)3
A CUBE WITH 10 CM LENGTH HAS A VOLUME OF (10CM)3
WHILE A CUBE HAS A 100 CM EDGE LENGTH HAS A VOLUME OF (100CM)3

3. Some common units and their equivalents
Length
Mass
Volume
1 Km = miles
1kg = lb.
1 Liter = 1000 cm3
1 m = inches = 1.094yards
1lb = g
1Liter = quarts(qt)
1 foot = cm
1 ounce = 28.35g
1 Gallon = L
1 inch = 2.54cm

4. Density
Density = Mass/Volume or d = m/v Density of a substance is the ratio of its mass to its volume Density is a physical property Its also an intensive property Intensive property - Property that independent of the amount of the substance . Example : The density is same for a sample of 1gram of Aluminum and for 1kg of Aluminum Density of pure gold is 19.3 g/cm3

5. INTENSIVE AND EXTENSIVE PROPERTIES
INTENSIVE PROPERTY – INDEPENDENT OF THE AMOUNT OF SUBSTANCE
EXAMPLE : DENSITY
EXTENSIVE PROPERTY :PROPERTY THAT DEPENDS ON THE AMOUNT OF SUBSTANCE
EXAMPLE : VOLUME,MASS