2.2 Measured Numbers and Significant
2.2 Measured Numbers and Significant
- Determine the number of significant figures in a measured number.
- A measuring device is used when you make a measurement.
- You can use a meterstick to measure your height, a scale to check your weight, or a thermometer to take your temperature.
- The numerical cm values of the marked lines at the end of the object are used to report the length of the object.
- The final digit is the estimated value.
- The end of a rectangular object can be measured as mine is between 4.5 and 4.6 cm.
- The length is acceptable.
- Significant figures are always nonzero numbers.
- A zero may or may not be a significant figure depending on the number.
- We will place a point after a zero at the end of a number in this text.
- All zeros at the end of large standard numbers are not significant.
- Try Practice Problems 2.13 to 2.16 has only one significant figure.
- A friend might ask you how many classes you are taking.
- Counting the number of classes in your schedule is how you would answer.
- If you are asked to state the number of seconds in one minute, you should be able to provide it.
- There are 60 s in 1 min without using a measuring device.
- 1000 mL is 12 ft.
- Measuring tools are used to get the number of baseballs.
- There are three SFs in 42.2 g, all of which are 888-609- 888-609- 888-609- 888-609- 888-609-
- All the digits in the coefficients of a number written in scientific notation are significant, so there are two SFs in 10 cm.
- A quantity of three eggs is an exact number.
- The definition of equality in the metric system is that the mass of 1 kg and 1000 g are 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609-