Ppt Measurements Unit 1
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Transcript of Ppt Measurements Unit 1
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MEASUREMENT
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S.I. UNITS
• Le system International d’unites
• A modification of the older French metric system.
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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.
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Base Units
•Length
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Base Units
•Length
Meter
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Base Units
•Length
Meter
(m)
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Base Units
•Mass
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Base Units
•Mass
Kilogram
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Base Units
•Mass
Kilogram
(kg)
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Base Units
•Time
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Base Units
•Time
Seconds
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Base Units
•Time
Seconds
(s)
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Base Units
•Temperature
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Base Units
•Temperature
Kelvin
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Base Units
•Temperature
Kelvin
(K)
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Base Units
•Amount of Substance
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Base Units
•Amount of Substance
mole
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Base Units
•Amount of Substance
mole
(mol)
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Base Units
•Electric Current
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Base Units
•Electric Current
Ampere
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Base Units
•Electric Current
Ampere
(A)
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Base Units
•Luminous Intensity
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Base Units
•Luminous Intensity
candela
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Base Units
•Luminous Intensity
candela
(cd)
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Derived Units
•Area
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First Derivative
•Area
length squared
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Derived Units
•Area
length squared
(m2)
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Second Derivative
•Volume
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Second Derivative
•Volume
length cubed
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Second Derivative
•Volume
length cubed
(m3)
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Derived Units
•Density
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Derived Units
•Densitymass per unit volume
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Derived Units
•Densitymass per unit volume
(kg/m3)
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First Derivative
•Speed (velocity)
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Derived Units
•Speed (velocity)distance traveled per unit time
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Second Derivative
•Speed (velocity)distance traveled per unit time
(m/s)
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Third Derivative
•Acceleration
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Third Derivative
•Accelerationspeed changed per unit time
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Derived Units
•Accelerationspeed changed per unit time
(m/s2)
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Derived Units
•Force
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Derived Units
•Forcemass times acceleration of an object
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Derived Units
•Forcemass times acceleration of an object
(kg m/s2)
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Derived Units
•Force• Note:
(kg m/s2) = Newton (N)
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Derived Units
•Pressure
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Derived Units
•Pressure
Force per unit area
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Derived Units
•Pressure
Force per unit area
(kg /m s2) or N/m2
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Derived Units
•PressureNote:
(kg /m s2) = N/m2 = Pascal (Pa)
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Derived Units
•Energy
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Derived Units
•Energy Force times distance traveled
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Derived Units
•Energy Force times distance traveled
(kg m2 /s2)
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Derived Units
•EnergyNote:
(kg m2 /s2) = Joule (J)
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Other Units to Know About
• Length
–Angstrom (Å) = 10-10m
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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.
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Other Units to Know About
• Temperature3 common scales
Fahrenheit
Celsius
Kelvin
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In the fahrenheit scale, what is the temperature of freezing and boiling water?
Temperature
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Temperature
Freezing Pt Boiling Pt
32 °F 212 °F
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Other Units to Know About
• Length
–Angstrom (Å) = 10-10m
In the Celsius scale, what is the temperature of freezing and boiling water?
Temperature
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Freezing Pt Boiling Pt
32 °F 212 °F 0 °C 100 °C
Temperature
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In the Kelvin scale, what is the temperature of freezing and boiling water?
Temperature
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Temperature
Freezing Pt Boiling Pt
32 °F 212 °F
0 °C 100 °C
273.15 K 373.15 K
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Temperature• Formulas for converting scales
°C + 273.15 = K
1.8(°C ) + 32 = °F
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Other units to know about
•Volume
Liter (l) = 1 dm3
1 l = 1.06 qt
1 ml = 1 cm3