Page 116 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

(6) While writing derived units a slash (/) is used to denote
division. But never use more than one slash in one derived
unit.
2
eg. m/s (correct) m/s/s (wrong)
(7) When a derived unit is expressed as the product of other
units use a dot or a space between them.

eg. N.m or N m
(8) Do not mix the name of a unit with the symbol
3
eg. kg/m (correct)
kilogram per cubic metre (correct)
kg/cubic metre (wrong)
3
kilogram per m (wrong)
kg per m (wrong)
3
3
kilogram/m (wrong)
kilogram/cubic metre (wrong)
(9) While writing units along with a value, there must be single
space between them.
eg. 273 K (correct) 273K (wrong)
100 m (correct) 100m (wrong)

(10) Never use more than one unit to express a physical quantity.
eg. 10.25 m ( correct) 10 m 25 cm (wrong)

Significant learning outcomes

The learner can

explain the necessity of measurements of physical
quantities and their units.
describe the necessity of unified units.
recognise derived units based on SI units and use them
appropriately in different situations.

recognise the features of SI units and use them appropriately
in different situations.
explain the concept of mass, volume and find the density
of substances.

record units and their symbols properly in different
situations.

Basic Science VIII 115