MEASUREMENT
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MEASUREMENT
S.I. UNITS
• Le system International d’unites
• A modification of the older French metric system.
Base Units
Base units are considered so because they are not derived from any pre-existing number or formula. We need to be able to discuss things like distance, temperature and time, and we do so by agreeing to a reliable definition of some basic (base!) facts.
Base Units
•Length
Base Units
•Length
Meter
Base Units
•Length
Meter
(m)
Base Units
•Mass
Base Units
•Mass
Kilogram
Base Units
•Mass
Kilogram
(kg)
Base Units
•Time
Base Units
•Time
Seconds
Base Units
•Time
Seconds
(s)
Base Units
•Temperature
Base Units
•Temperature
Kelvin
Base Units
•Temperature
Kelvin
(K)
Base Units
•Amount of Substance
Base Units
•Amount of Substance
mole
Base Units
•Amount of Substance
mole
(mol)
Base Units
•Electric Current
Base Units
•Electric Current
Ampere
Base Units
•Electric Current
Ampere
(A)
Base Units
•Luminous Intensity
Base Units
•Luminous Intensity
candela
Base Units
•Luminous Intensity
candela
(cd)
Derived Units
•Area
First Derivative
•Area
length squared
Derived Units
•Area
length squared
(m2)
Second Derivative
•Volume
Second Derivative
•Volume
length cubed
Second Derivative
•Volume
length cubed
(m3)
Derived Units
•Density
Derived Units
•Densitymass per unit volume
Derived Units
•Densitymass per unit volume
(kg/m3)
First Derivative
•Speed (velocity)
Derived Units
•Speed (velocity)distance traveled per unit time
Second Derivative
•Speed (velocity)distance traveled per unit time
(m/s)
Third Derivative
•Acceleration
Third Derivative
•Accelerationspeed changed per unit time
Derived Units
•Accelerationspeed changed per unit time
(m/s2)
Derived Units
•Force
Derived Units
•Forcemass times acceleration of an object
Derived Units
•Forcemass times acceleration of an object
(kg m/s2)
Derived Units
•Force• Note:
(kg m/s2) = Newton (N)
Derived Units
•Pressure
Derived Units
•Pressure
Force per unit area
Derived Units
•Pressure
Force per unit area
(kg /m s2) or N/m2
Derived Units
•PressureNote:
(kg /m s2) = N/m2 = Pascal (Pa)
Derived Units
•Energy
Derived Units
•Energy Force times distance traveled
Derived Units
•Energy Force times distance traveled
(kg m2 /s2)
Derived Units
•EnergyNote:
(kg m2 /s2) = Joule (J)
Other Units to Know About
• Length
–Angstrom (Å) = 10-10m
Other Units to Know About
• PressureAtmosphere (atm) def.- the pressure exerted by the earth’s armosphere at sea level on an average day.
torr or mm of Mercury (mmHg) def.-the pressure exerted by a column of mercury (Hg) 1 mm high.
Other Units to Know About
• Temperature3 common scales
Fahrenheit
Celsius
Kelvin
In the fahrenheit scale, what is the temperature of freezing and boiling water?
Temperature
Temperature
Freezing Pt Boiling Pt
32 °F 212 °F
Other Units to Know About
• Length
–Angstrom (Å) = 10-10m
In the Celsius scale, what is the temperature of freezing and boiling water?
Temperature
Freezing Pt Boiling Pt
32 °F 212 °F 0 °C 100 °C
Temperature
In the Kelvin scale, what is the temperature of freezing and boiling water?
Temperature
Temperature
Freezing Pt Boiling Pt
32 °F 212 °F
0 °C 100 °C
273.15 K 373.15 K
Temperature• Formulas for converting scales
°C + 273.15 = K
1.8(°C ) + 32 = °F
Other units to know about
•Volume
Liter (l) = 1 dm3
1 l = 1.06 qt
1 ml = 1 cm3
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