Procedure
Watch the video first to better understand how to use a centigram balance and to understand the necessity of measuring mass with accuracy.
1. Locate the balance or scale you are going to use. Identify how many significant digits you can use when reporting the mass of an object. For example, if your balance or scale's precision is +/- 0.01 g then you should record the mass to the estimated hundredth place.
2. To assure the balance or scale is accurate, measure the mass of the can of food. If the balance or scale does not measure the amount of mass on the can correctly then adjust it accordingly if possible.
3. Measure the mass of five additional objects three times. Make sure that you zero out or tare between each measure. All masses need to be recorded in a chart.
4. Create a chart for your measurements (an example is provided below). Above the chart, identify the type of balance or scale you are using, the precision of the balance or scale, and the original mass of the can of food. Within the chart, write the name of the objects and record the masses of each object.
5. Submit your data and write a conclusion for the experiment.
Type of balance or scale ____________________
Precision of balance or scale +/- ____________ g
Mass of the can _______________ g
Name of Object Mass(g) 1 Mass(g) 2 Mass(g) 3
Can of food
your object 1
your object 2
your object 3
your object 4
your object 5
Submission Requirements
Submit your data by including the type of balance or scale, the precision of the balance or scale, the mass of the can of food, and a chart of your data. Make sure you record your mass using the correct number of significant digits.
Write a conclusion evaluating your skills and address the following questions:
1) How did the experiment demonstrate accuracy in measuring when using the can of food? Give evidence for your answer.
2) How did the experiment demonstrate precision in measuring? Give evidence for your answer.
