The document discusses units of measurement used in the metric system for length, mass, volume, and time. It explains that the metric system uses SI units which are based on meters, kilograms, seconds, and kelvins. It differentiates between mass, which is a measure of the amount of matter, and weight, which is the force exerted by mass due to gravity. Various tools for measurement are also introduced, such as balances, scales, graduated cylinders and thermometers.

1. Tools andTools and
MeasurementMeasurement

2. Recall (Recall (ทบทวนทบทวน))
UNITS OF MEASUREMENTUNITS OF MEASUREMENT
UseUse SI unitsSI units — based on the metric system— based on the metric system
LengthLength
MassMass
VolumeVolume
TimeTime
TemperatureTemperature
Metre, mMetre, m
Kilogram, kgKilogram, kg
Seconds, sSeconds, s
kelvins, Kkelvins, K
Cubic metre ,mCubic metre ,m33

3. Mass vs. WeightMass vs. Weight
• Mass: Amount ofMass: Amount of
Matter (grams orMatter (grams or
kilograms measuredkilograms measured
with a BALANCE)with a BALANCE)
• Weight: ForceWeight: Force
exerted by the mass,exerted by the mass,
only present withonly present with
gravity (Newton,gravity (Newton,
measured with ameasured with a
SCALE)SCALE)
Can you hearCan you hear
me now?me now?

4. A BALANCEA BALANCE
A ScaleA Scale

5. EqualitiesEqualities
State the same measurement in twoState the same measurement in two
different unitsdifferent units
lengthlength
10.0 in.10.0 in.
25.4 cm25.4 cm

6. Instruments for Measuring VolumeInstruments for Measuring Volume
Graduated
cylinder
Syringe Volumetric
flaskBuret Pipet

7. Units of Measuring VolumeUnits of Measuring Volume
1 L = 1000 mL
1 qt = 946 mL
Timberlake, Chemistry 7th
Edition, page 3

8. Reading a MeniscusReading a Meniscus

9. Units for Measuring MassUnits for Measuring Mass
1 kg = 2.20 lb
Timberlake, Chemistry 7th
Edition, page 3

10. Quantities ofQuantities of
MassMass
Kelter, Carr, Scott, Chemistry A Wolrd of Choices 1999, page 25
Earth’s atmosphere
to 2500 km
Ocean liner
Indian elephant
Average human
1.0 liter of water
Grain of table salt
Typical protein
Uranium atom
Water molecule
1024
g
1021
g
1018
g
1015
g
1012
g
109
g
106
g
103
g
100
g
10-3
g
10-6
g
10-9
g
10-12
g
10-15
g
10-18
g
10-21
g
10-24
g
Giga-
Mega-
Kilo-Kilo-
base
milli-milli-
micro-
nano-
pico-
femto-
atomo-

11. Some Tools for MeasurementSome Tools for Measurement
Which tool(s)Which tool(s)
would you usewould you use
to measure:to measure:
A.A. temperaturetemperature
B.B. volumevolume
C.C. timetime
D.D. weightweight

12. Learning CheckLearning Check
MatchMatch L) lengthL) length M) massM) mass V)V)
volumevolume
____ A. A bag of tomatoes is 4.6 kg.____ A. A bag of tomatoes is 4.6 kg.
____ B. A person is 2.0 m tall.____ B. A person is 2.0 m tall.
____ C. A medication contains 0.50 g____ C. A medication contains 0.50 g
Aspirin.Aspirin.
M
L
M
V

13. Learning CheckLearning Check
What are some U.S. units thatWhat are some U.S. units that
are used to measure each ofare used to measure each of
the following?the following?
A. lengthA. length
B. volumeB. volume
C. weightC. weight
D. temperatureD. temperature

14. Learning CheckLearning Check
Select the unit you would use to measureSelect the unit you would use to measure
1. Your height1. Your height
a) millimetersa) millimeters b) metersb) meters c) kilometersc) kilometers
2. Your mass2. Your mass
a) milligramsa) milligrams b) gramsb) grams c) kilogramsc) kilograms
3. The distance between two cities3. The distance between two cities
a) millimetersa) millimeters b) metersb) meters c) kilometersc) kilometers
4. The width of an artery4. The width of an artery
a) millimetersa) millimeters b) metersb) meters c) kilometersc) kilometers

15. SolutionSolution
1. Your height1. Your height
b) metersb) meters
2. Your mass2. Your mass
c) kilogramsc) kilograms
3. The distance between two cities3. The distance between two cities
c) kilometersc) kilometers
4. The width of an artery4. The width of an artery
a) millimetersa) millimeters

16. 1. 1000 m = 11. 1000 m = 1 ______ a) mm b) km c) dma) mm b) km c) dm
2. 0.001 g = 12. 0.001 g = 1 ______ a) mg b) kg c) dga) mg b) kg c) dg
3. 0.1 L = 13. 0.1 L = 1 ______ a) mL b) cL c) dLa) mL b) cL c) dL
4. 0.01 m = 1 ___4. 0.01 m = 1 ___ a) mm b) cm c) dma) mm b) cm c) dm
Learning CheckLearning Check

17. 1. 1000 m = 11. 1000 m = 1 ______ a) mma) mm b) kmb) km c) dmc) dm
2. 0.001 g = 12. 0.001 g = 1 ______ a) mga) mg b) kg c) dgb) kg c) dg
3. 0.1 L = 13. 0.1 L = 1 ______ a) mL b) cLa) mL b) cL c) dLc) dL
4. 0.01 m = 1 ___4. 0.01 m = 1 ___ a) mma) mm b) cmb) cm c) dmc) dm
Learning CheckLearning Check