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The International System of Measurement
(SI)
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SI
System of measurement used world wide
Makes communication between countries, languages and different measurement systems easy, consistent
Uniformed – everyone is “speaking the same language”
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Base Quantities
Base Units Symbol
Length Meter m
Mass Gram g
Volume Liter l
Temperature Celsius C
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Prefixes
Used to change the size of the value
Used in front of the base unit
Used to make large numbers smaller and smaller numbers larger
Does not change the value itself
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Common Prefixes
Prefix Symbol ValuePower of
10
kilo- k- 1000 103
hecto- h- 100 102
deca- da- 10 101
Base unit g,l,m 1 100
deci- d- 1/10 10-1
centi- c- 1/100 10-2
milli- m- 1/1000 10-3
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Unit ConversionsUsed to change from one sized unit to another
Value does not change only the size of the unit
ex: 1 dollar = 100 pennies = 20 nickels =
10 dimes = 4 quarters
Value ($1) remains the same, just the size of the unit changes
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Tools of Measurement
Equipment used to measure mass, length, volume and temperature
Each tools measures in its own unit
The smaller the unit the more accurate the measurement
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Tools of measurement (con’t)
Base Quantities
Tools Units
Mass Balance Grams
VolumeGraduated Cylinder
milliliters
Length Metric ruler cm/m
Temperature thermometer ºC
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C. Derived UnitsCombination of base units.
Volume - length length length
1 cm3 = 1 mL 1 dm3 = 1 L
Density - mass per unit volume (g/cm3)
D = MV D
M
V
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D. DensityAn object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.
GIVEN:
V = 825 cm3
D = 13.6 g/cm3
M = ?
WORK:
M = DV
M = (13.6 g/cm3)(825cm3)
M = 11,220 g
DM
V
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D. Density1) A liquid has a density of 0.87 g/mL. What
volume is occupied by 25 g of the liquid?
GIVEN:
D = 0.87 g/mL
V = ?
M = 25 g
DM
V
WORK:
V = M D
V = 25 g
0.87 g/mL
V = 28.7 mL
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D. Density2) You have a sample with a mass of 620 g & a
volume of 753 cm3. Find density.
GIVEN:
M = 620 g
V = 753 cm3
D = ?
DM
V
WORK:
D = M V
D = 620 g
753 cm3
D = 0.82 g/cm3