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Questions and Answers
What is the purpose of using a method called chain-link conversion in physics?
What is the purpose of using a method called chain-link conversion in physics?
What is the condition for using a conversion factor in chain-link conversion?
What is the condition for using a conversion factor in chain-link conversion?
Why is it necessary to treat each number and its unit together in chain-link conversion?
Why is it necessary to treat each number and its unit together in chain-link conversion?
What is the result of multiplying a physical quantity by a conversion factor?
What is the result of multiplying a physical quantity by a conversion factor?
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What is the purpose of the conversion factors given in Appendix D?
What is the purpose of the conversion factors given in Appendix D?
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What is the definition of the meter in the SI system?
What is the definition of the meter in the SI system?
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What is the purpose of sending accurate copies of the standard meter bar to standardizing laboratories?
What is the purpose of sending accurate copies of the standard meter bar to standardizing laboratories?
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Why is it necessary to invert the conversion factor if unwanted units do not cancel?
Why is it necessary to invert the conversion factor if unwanted units do not cancel?
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Study Notes
Unit Conversion
- Chain-link conversion is a method used to change the units of a physical quantity.
- In this method, the original measurement is multiplied by a conversion factor, which is a ratio of units equal to unity.
- Conversion factors can be used to cancel unwanted units in a conversion.
Examples of Conversion Factors
- 1 min = 60 s, so the ratios (1 min)/(60 s) and (60 s)/(1 min) can be used as conversion factors.
- These conversion factors can be used to convert between units, such as converting 2 min to seconds: 2 min = (2 min)(1) = (2 min)(60 s / 1 min) = 120 s.
Important Notes
- When introducing a conversion factor, make sure unwanted units cancel; if not, invert the factor and try again.
- Units obey the same algebraic rules as variables and numbers in conversions.
History of the Meter
- In 1792, the Republic of France established a new system of weights and measures with the meter as its cornerstone.
- The meter was initially defined as one ten-millionth of the distance from the north pole to the equator.
- Later, the definition was changed to be the distance between two fine lines on a platinum-iridium bar, the standard meter bar.
Standardization of the Meter
- The standard meter bar was kept at the International Bureau of Weights and Measures near Paris.
- Accurate copies of the bar were sent to standardizing laboratories around the world.
- These secondary standards were used to produce more accessible standards, ultimately allowing for widespread use of the meter.
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Description
This quiz covers the method of chain-link conversion, which involves multiplying the original measurement by a conversion factor to change units of a physical quantity.
