quantities and units
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Quantities and Units. Afit Sutiyawan , S.Pd. Environmental. - PowerPoint PPT PresentationTRANSCRIPT
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QUANTITIES AND UNITS Afit Sutiyawan, S.Pd
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Environmental
Apabila di sebuah ruang tunggu praktek dokter di kotamu ada seorang yang akan memeriksakan anaknya bercerita berulang-ulang dengan nyaring bahwa, Ia semalam telah mengukur suhu badan anaknya menggunakan barometer, ternyata suhu badan anaknya 40 kg
What was the reaction of other people who heard that
statement?
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Physical Quantities
Something that can be measured and the results can be expressed with the value and units called Physical Quantities
Quantities
Principal Quantities
Derivatives Quantities
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Principal Quantities
Quantities of principal is the amount that had been established and is the basic quantities, quantities of goods consisting of seven quantities:NO Principal Quantities Unit Abbreviation Dimension
1 length Meter m L
2 Mass Kilogram kg M
3 Waktu Time Second s T
4 Electric current Ampere A I
5 Temperature Kelvin K θ
6 Light Intensity Candela Cd j 7 Number of
Substance Mole mol N
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Dimension
Dimension is defined the way it was composed by the mass quantities of goods.
Use Dimensions: To reduce the force of a magnitude To investigate the truth of a formula or
equation
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Derivatives Quantities
Derivatives Quantities is defined as the quantities are converted or derived from the principal quantitiesNO Principal Quantities Rumus Formula Dimension
1 Wide length x width [L] 2 2 Volume length x width x height [L] 3
3 Density Mass : Volume [M] [L] -3
4 velocity space : time [L] [T] -1 5 Acceleration velocity : time [L] [T] -2 6 Force mass x acceleration [M] [L] [T] -2
7 Work and Energy force x displacement [M] [L] 2 [T] -2
8 Impulse and Momentum
force x time [M] [L] [T] -1
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Standard of Units Unit of Mass => a cylinder made of
platinum iridium, which is stored in the Bureu of international weights and measures in Sevres
Unit of Length => the distance of light (in vacuum) at intervals 1/299.792.458 seconds.
Unit of Time => time required cesium-133 atom vibrates 9,192,631,770 times
Unit of Temperature => temperature of the melting point of ice at 76 cmHg is T = 273.15 K, the temperature of the boiling point of water at 76 cmHg is T = 373.15 K
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Standard of Units
Unit of electric current => amount of electric charge of one coulomb (1C = 6.25 x 10 18 electrons) that passes through a cross-section in one second
Unit of light intensity => black body width of 1 m 2 a temperature melting point of platinum (1773 0 C) will emit light in a direction perpendicular to a strong and light for 6 x 10 5 candela.
Units of amount of substance => one composed of 6.025 mol x 10 23 particles