Every measurement has to have a value and a unit.
The value is the number you have measured
The unit shows us what you have been measuring

Quantity Unit Method of measurement
Distance Metre (m)
Centimetre(cm)
Use a metre rule
Time Second (s) Stop watch, timer
Mass Kilogram (kg)
G
ram (g)
Use a top pan balance
Force Newton (N) Spring balance (newton metre)
Weight Newton (N) Spring balance or scales
Energy Joules (J) Energy meter
Pressure Newtons per square centimetre (N/cm2) Use the formula:

 Pressure = force area
Density Grams per cubic centimetre (g/cm3) Use the formula :

 Density = mass volume
Volume
Cubic centimetre (cm3) For a rectangular block use the formula
V= height x width x length
For a liquid, use a measuring cylinder.
Volume of a liquid Millilitre (ml)
Area Square centimetre (cm2) use the formula:area = length x width
Current amp, (A) Use an ammeter
Voltage Volt (V) Use a voltmeter
Temperature Degrees Celsius (E C) Use a thermometer
Speed Metres per second (m/s) Use the formula:

 speed  = Distance Time