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2.5 Writing Conversion Factors

- For two units that describe the same quantity, write a conversion factor.

- If someone asked Writing Conversion Factors from you how many minutes you worked on your homework, you would probably say 2.0 h. 120 min is how long you would answer it.

- You knew the equality that related the two units.

- You didn't change the amount of time you spent studying when you expressed 2.0 h as 120 min.
- You only changed the unit of measurement.

- Try Practice Problems 2.43 is always possible with two conversion factors.
- The units should be included in the conversion factors.

- A km is 1000 m a ft is 12 in.

- 2.54 cm is 1 in.

- In medicine, 1 h is 60 min 1 h is 60 s.

- Significant figures are not determined by numbers in a definition.
- The equality of 1 g is a definition, which means that the numbers 1 and 1000 are exactly the same.

- The equality of 1 lbs is obtained by measuring the grams in 1 lbs.

- The measured quantity 454 g has three significant figures.
- The relationship of 1 in is an exception.
- It has been defined as 2.54 cm.

- We can write two metric conversion factors.

- The inverse of the other is a proper conversion factor.
- The usefulness of conversion factors is enhanced by the fact that we can turn a conversion factor into an inverse one.

- If you need to convert from pounds to kilograms, you should use the metric system.

- The relationship between the speed of a car in kilometers per hour and the amount of vitamins in a pill would only be related to the problem.
- We can identify each number as exact or give the number of significant figures from each of the following statements.

- The car traveled at a high rate of speed.

- The 1 h is correct.

- One tablet contains 500 IU of vitamins C and E.

- One of the tablets has a significant figure.
- The tablet is exactly what it is.

- A person with 18% body fat by mass.
- 18 mass units of body fat can be written as 100 mass units of body mass.
- The units used for the factor must be the same for different mass units.

- The body mass significant figures are two of 100 kilogram body mass.
- The 100 kilogram is correct.

- Equalities can be determined by the thickness of the skin-fold at the abdomen, as well as the percentage of body fat.

- The quantity of Keflex in a capsule can be written as an equality from which two conversion factors are possible.

- The capsule is exactly what it is.

- Greg has high blood pressure and takes a medication called propranolol.

- Cold-water fish such as salmon have Omega 3's.

- propranolol is in 1 tablet.

- The tablet is exactly what it is.

- High blood pressure can be lowered with propranolol.

- Cold-water fish such as salmon have Omega 3's.

- The 1.9 g is measured with 100 g of salmon being two significant figures.
- The 100 g is the same as before.

- Levsin can be used to treat stomach and bladder problems.

- It has three SFs.
- The exact amount is 1 mL.

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