1. The International System of Units & Conversions
Saturday, November 17, 2018
The International System of Units & Conversions
Packet #7
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© Ryan Barrow 2008

2. Saturday, November 17, 2018
Introduction
The data recorded, during the experiment, has to be in a language that is understood by different individuals within the same field.
In chemistry, the International System of Units (SI) is used.
The International System of Units is a revised version of the metric system
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© Ryan Barrow 2008
© Ryan Barrow 2008

3. 11/17/2018
Introduction II
In Chemistry, one might come across one these quantities that are measure in SI base units.
Mass  Kilogram (kg)
Temperature  Kelvin (K)
Volume*  Cubic Meter (m3) / Liter (L) *
Length  Meter (m)
Time  Second (s)
Amount of Substance  Mole (mol)
Electric Current  Ampere (A)
Luminous intensity  Candela (cd)
Liter is a non-SI Unit
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© Ryan Barrow 2008
© Ryan Barrow 2008

4. Common Prefixes & Conversions
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5. Introduction
There are times that some measurements may be extremely small or extremely large.
Due to those measurements, it is often wise to utilize a unit with a particular prefix.
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6. Units of Measurements Prefixes
Saturday, November 17, 2018
Units of Measurements Prefixes
Prefixes that denote multiples of 10
Tera 1012
Giga 109
Mega 106
Kilo 103
Centi 10-2
Milli 10-3
Micro 10-6
Nano 10-9
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© Ryan Barrow 2008
© Ryan Barrow 2008

7. Mass
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8. Mass The measurement of the amount of matter in an object
Saturday, November 17, 2018
Mass
The measurement of the amount of matter in an object
Mass is measured in kilograms (kg).
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© Ryan Barrow 2008
© Ryan Barrow 2008

9. Mass II Common Conversions 1 kilogram = 1000 grams
1 gram = 1000 milligrams
1000 kilograms = 1 metric ton
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10. Mass vs. Weight Mass and weight are different Force
Saturday, November 17, 2018
Mass vs. Weight
Mass and weight are different
Force
The push or pull required to change the state of motion of an object
Measured in Newtons (N)
Gravitational Force
The force of attraction that every particle of mass in the universe exerts on every other particle
Weight is the pull of gravity on a body of mass
Weight is the force that gravity exerts on an object.
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© Ryan Barrow 2008
© Ryan Barrow 2008

11. Saturday, November 17, 2018
Mass vs. Weight II
Mass is always constant regardless of where the mass is located in the universe
Weight changes depending on the amount of gravitational force
Block #2 & 4
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© Ryan Barrow 2008
© Ryan Barrow 2008

12. Calculating Weight F = ma Force (N) = mass (kg) * acceleration (m/s2)
Saturday, November 17, 2018
Calculating Weight
F = ma
Force (N) = mass (kg) * acceleration (m/s2)
Weight is a measurement of force
W = mg
g = acceleration due to gravity
9.8 m/s2 ((10 m/s2))
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© Ryan Barrow 2008
© Ryan Barrow 2008

13. Temperature
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© Ryan Barrow 2008

14. Saturday, November 17, 2018
Temperature
The degree of hotness or coldness of a body of mass or environment.
There are three scales of measurement
Celsius
The scale of choice
Fahrenheit
Kelvin
0 degrees = Absolute zero (lowest possible temperature that can be attained by cooling an object.
In chemistry, Kelvin is the SI unit.
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© Ryan Barrow 2008
© Ryan Barrow 2008

15. Conversions Among Temperature Scales
Saturday, November 17, 2018
Conversions Among Temperature Scales
Scales
Celsius
T (Celsius) = (5/9)*(T (Fahrenheit) -32)
Fahrenheit
T (Fahrenheit) = ((9/5) * (T (Celsius)) + 32
Kelvin (Absolute)
0 degrees = Absolute zero (lowest possible temperature that can be attained by cooling an object
= T (Celsius)
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© Ryan Barrow 2008
© Ryan Barrow 2008

16. Volume
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17. Volume The amount of space that a 3D object takes up
Saturday, November 17, 2018
Volume
The amount of space that a 3D object takes up
Volume is measured in liters /cubic meters
1 Liter = 1000 milliliters (mL)
1 Liter = 1000 cubic centimeters (cm³)
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© Ryan Barrow 2008
© Ryan Barrow 2008

18. Volume Common Conversions within volume
Saturday, November 17, 2018
Volume
Common Conversions within volume
1 Liter = 1000 milliliters (mL)
1 Liter = 1000 cubic centimeters (cm³)
1 Liter = 1 cubic meter (m3)
1 ml = 1 cm3
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© Ryan Barrow 2008
© Ryan Barrow 2008

19. Length
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20. Saturday, November 17, 2018
Length
A linear measurement of an object, end-to-end; it is usually the longest dimension.
Length is measured in meters.
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© Ryan Barrow 2008
© Ryan Barrow 2008

21. Length Common Conversions 1 meter = 100 cm 1 centimeter = 10 mm
Saturday, November 17, 2018
Length
Common Conversions
1 meter = 100 cm
1 centimeter = 10 mm
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© Ryan Barrow 2008
© Ryan Barrow 2008

22. Review
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© Ryan Barrow 2008