PHYSICAL QUANTITIES & UNITS
Hazrin Shah Bin Hj Azahari 08B0912
Mohammad Dedyardie Takong 08B0904
MICROMETER
SCREW GAUGE
1.
2.
3.
4.
Example :
To find the thickness of a
paper
metre
centimetre
millimetre
kilometre
Use to measure
very small value
VERNIER
CALIPERS
Example :
To measure the internal
& external length
Units commonly used
Use to measure
the internal and
external
diameter of
object
Use to measure
longer length
MEASURING
TAPE
Example :
Length of a door
LENGTH
Instruments used
Use to measure
short length
RULER
Example :
Width of a book
1.
2.
3.
4.
Metre rule
Measuring tape
Vernier caliper
Micrometre
screw gauge
OBJECTIVES
• Use and describe how to use vernier
scale and calipers
• Use and describe how to use micrometer
screwgauge
VERNIER CALIPER
Inside
jaw
Locking nut
Main scale
Vernier
scale
Outside
jaw
Roller
Tail
TYPES OF VERNIER CALIPER
1. Basic vernier caliper
2. Long Jaw vernier
caliper
TYPES OF VERNIER CALIPER
3. Knife Edge vernier
caliper
4. Chiesel Shape vernier
caliper
VERNIER CALIPER
1. Vernier caliper is used to measure the:
a) the external diameter of an object
b) the internal diameter of an object
c) depth of a tube
2. It is used to measure length to the nearest 0.01 cm
or 0.1 mm
SCALES IN A VERNIER CALIPER
Main scale
Vernier scale
HOW TO USE A VERNIER CALIPER
1. Slide the vernier scale
along the main scale so
that an object can be
inserted into the jaws
(inside or outside jaw)
HOW TO USE A VERNIER CALIPER
2. Read the main scale up
to the zero line of the
vernier scale
HOW TO USE A VERNIER CALIPER
3. Read the vernier scale
by looking for the line in
the vernier scale which
is exactly opposite any
line in the main scale
http://members.shaw.ca/r
on.blond/Vern.APPLET/