what is mass?

Mass is the quantity of matter in a substance. The S.I unit of mass is a kilogram (kg). Other units of mass include: Tonnes (1tonne = 1000kg), Hectogram (Hg), Decagram (Dg), Gram (g), Decigram (dg), Centigram (cg), Milligram (mg), etc.

Instruments Used in measuring Mass

Weighing beam balance

Digital beam balance

Top arm beam balance

Lever arm beam balance

Tripple beam balance

image 110

Conversions

Example 1:
Convert the following as instructed:
(i) 100grams to kilograms
(ii) 2kg to dg
(iii) 40mg to kg
(iv) 20.55g to cg

Solution
(i) 100grams to kilograms

image 111

(ii) 2kg to dg

Solution
2kg to dg

image 112
image 113
(iii) 40mg to kg

Solution
40mg to kg
image 114
(iv) 20.55g to cg

Solution

20.55g to cg
image 115