Units of measurement in Chemistry

1. Standard/ Class/ Grade XI Chemistry
Chapter 1 Basic concepts
Fundamental/ Base quantity SI unit Symbol
Length metre m
Mass kilogram kg
Time second s
Temperature Kelvin K
amount of substance Mole mol
electric current Ampere A
luminous intensity Candela cd
Unit: A unit is any standard used for comparison
• Units are based on the International System of Units or SI system
(French: Système international d'unités, SI)
• Fundamental/ Base units form the basis of the derived units
• Derived units are derived by a combination of the base units. E.g.
area (m2) and acceleration (m/s2)

2. The measurements given below range from small to big. They are
arranged in an ascending order.
Femtometre on the extreme left is smaller than (<) petametre on the
extreme right.
femtometre fm (10-15 m) < picometre pm (10-12 m) < nanometre nm
(10-9 m) < micrometre µm (10-6 m) < millimetre mm (10-3 m) <
centimetre cm (10-2 m) < decimetre dm (10-1 m) < metre m (100 m) <
decametre dam (101 m) < hectometre hm (102 m) < kilometre km (103
m) < megametre Mm (106 m) < gigametre Gm (109 m) < terametre Tm
(1012 m) < petametre Pm (1015 m)
Sizes: atom and
subatomic particles

3. centimetre, millimetre

4. inch, centimetre, millimetre

5. centimetre, millimetre