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Units of length

Bob Jones PPT Notes -- Chapter 3a

Subject: 
Chemistry
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measurement
Systems of units
Units of length
SI derived units
Centimetre gram second system of units
SI units
International System of Units
Conversion of units
Centimetre
Litre
Units conversion by factor-label
Orders of magnitude

Measuring and Units 1 All slides in this section contain: Clipart.com items: 8260752, 7804277 The Dominion Mandate requires us to gain knowledge about God?s creation. To do so, we must take measurements. Measurement measurement the act of comparing an unknown quantity to a standard unit When you write a measurement ? You must have a number. You must have a unit. (How much information does the statement ?I ran 7? give you?) instrument a device to aid in measuring Is accurately subdivided Is calibrated Instrument Has units on a scale Started with the metric system. Expanded to SI. SI System (International System of Units) We will use 5 of these. There are 7 base units. SI System (International System of Units) base units units that do not come from other units Chemistry Base Units

AP Physics

Subject: 
Physics
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measurement
Units of length
Metrology
Customary units in the United States
Arithmetic
Centimetre
Foot
Uncertainty
Conversion of units
Scientific Notation
1 centimetre
Litre

Presentation of chapter 1 Frank Chen Period 5 1.4 Conversion of Units In 1960, an international committee established a set of fundamental quantities of science which is called SI. There is also a set of U.S. customary units, theses are some examples of convert U.S. into SI: 1 mile = 1609 m = 1.609 km; 1 m = 39.37 in. = 3.281 ft; 1 ft = 0.3048m = 30.48 cm; 1 in = 0.0254m = 2.54 cm Conversion Factors The method to convert the different units into the required unit Ex. 13.0 in. = (15 in.)(2.54 cm/1in.) = 38.1 cm 1.5 Order of magnitude Order of Magnitude is an scientific method use symbol ?~?to estimate a magnitude round into one digit and expressed in scientific notation. Ex. 0.00054m ~ 10^-4m 3600m ~ 10^3m 4 1.6 Uncertainty in Measurements
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