Physical Quantity
Transcript of Physical Quantity
Physical quantity
SI units
LengthMass
Time
TemperatureElectrical current
What is length?What is length?
Distance between two Distance between two pointspoints
Length
Common units used for measuring Common units used for measuring lengthlength
1 mm = __________cm = _________m = 1 mm = __________cm = _________m = _______km_______km
______mm = 1 cm = ______m = ______km______mm = 1 cm = ______m = ______km ______mm = ______cm = 1 m = ______km______mm = ______cm = 1 m = ______km ______mm = ______cm = _______m = 1 km______mm = ______cm = _______m = 1 km
Common units used for measuring Common units used for measuring lengthlength
1 mm = 0.1 cm = 1 x 101 mm = 0.1 cm = 1 x 10-1-1= 0.001m = 1 = 0.001m = 1 x 10x 10-3-3 = 0.000001 km = 1 x 10 = 0.000001 km = 1 x 10-6-6
10 mm = 1 cm = 0.1 m = 0.0001 km10 mm = 1 cm = 0.1 m = 0.0001 km 1000 mm =100 cm = 1 m = 0.001 km1000 mm =100 cm = 1 m = 0.001 km 100000 mm = 1 x 10100000 mm = 1 x 1055 = 10000 cm = 1 = 10000 cm = 1
x 10x 1044 = 1000 m = 1 km = 1000 m = 1 km
Time
Mass
Mass
Temperature
Temperature
Electric current
Electric current
Electric current
Physical quantities
Physical quantities
Physical quantities
Physical quantities
DERIVATIVES UNITSDERIVATIVES UNITS
AREAAREA
total surface of an objecttotal surface of an object For regular surface like square – can be For regular surface like square – can be
calculated by using formulae.calculated by using formulae. For irregular shape like leaves – estimate by For irregular shape like leaves – estimate by
using graph paper.using graph paper.
complete boxes + equal to half or more complete boxes + equal to half or more than half ≠ areathan half ≠ area
Calculate you palm by using a 1cmCalculate you palm by using a 1cm22 grid line. grid line.
VOLUMEVOLUME
Space occupied by an object / total space of an Space occupied by an object / total space of an object.object.
Unit in cubic meter mUnit in cubic meter m33
Using formulae for regular solid objectsUsing formulae for regular solid objects Measuring cylinder, burette, pipette and Measuring cylinder, burette, pipette and
measuring flask.measuring flask. Eyes – same level – bottom of the meniscus ( oil, Eyes – same level – bottom of the meniscus ( oil,
water, alcohol) / top of the meniscus (mercury)water, alcohol) / top of the meniscus (mercury) Irregular shaped solid – water displacement Irregular shaped solid – water displacement
method.method.
Prefixes
Prefixes
Prefix Symbol Numerical value
Giga G 1 000 000 000
Mega M 1 000 000Kilo k 1 000
Prefixes
Prefix Symbol Numerical value
Deci d 0.1Centi c 0.01Milli m 0.001
Prefix Symbol Numerical value
Micro µ 0.000 001Nano n 0.000 000
001Piko p 0.000 000
000 001
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