and their Units PHYSICAL QUANTITY refers to a quantity that can be measured Measured in SI Units which means International System of Units used all over the world PREFIX A prefix is added to a unit to change the value of the unit ID: 919711
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Slide1
MEASUREMENTS
LESSON 2
Slide2Physical Quantities
and their Units
PHYSICAL QUANTITY
refers to a quantity that can be measured.Measured in SI Units which means International System of Units used all over the world
Slide3PREFIX
A prefix is added to a unit to change the value of the unit.
Prefixes are used in the SI unit to state a very small or a very big value.
We can write a quantity in the prefix form or standard form.
Giga, mega, and kilo are used for big quantities.
Deci
,
centi
,
milli
, micro and
nano
are used for small quantities.
Slide4Prefix & standard form
Rule: we can write a quantity in a prefixed form or standard form. In the standard form, a quantity is written as
, where1 ≤
a
≤10 and
n
is an integer.
Integer
- The integers are ..., -4 , -3 , -2 , -1 , 0, 1, 2, 3, 4, ... -- all the whole numbers and their opposites (the positive whole numbers, the negative whole numbers, and zero). Fractions and decimals are not integers.
Slide5Test yourself