1. Graphing Density

2. Scientists have collected the following data by measuring the masses of several samples of oil. The volume of each sample of oil was measured using a graduated cylinder and then masses using a scale.

3. Graphing Density Mass (g)Volume (ml) 2018.4 1513.8 1.92 3027.6 2523 54.6 109.2

4. Graphing Density The Scientists want to know the density of the oil. To do this we will need to make a line graph of the data points

5. Graphing Density First we need to Identify the independent and dependent variable –The scientists took different volumes of the oil. This means the volume is the independent variable And the mass is the dependent variable

6. Next we need to label the dependent and independent variable on our graph Graphing Density Dependent Variable Independent Variable

7. Graphing Density Next we number the lines on each axis. Round up to 5

8. Graphing Density Next we plot the data points

9. Graphing Density Now we draw a line of best fit through the data points

10. Graphing Density The slope of the line will tell use the density of the oil. Rise is measured in grams Run is measured in milliliters

11. Graphing Density Run= 18.4 ml -9.2 ml = 9.2 ml Rise= 20 g -10 g = 10 g Density = 10 g / 9.2 ml = 1.08 g/ml

12. Graphing Density From this graph we can conclude that the density of oil is 1.08 g/ml. We can now use this graph to predict the mass and the volume of oil if we know one variable.

13. Graphing Density Using the graph lets predict the mass of oil if the volume is 25 ml 27 g

14. Graphing Density Using the graph lets predict the volume of oild if it has a mass of 12.5 grams 11.6 ml

15. Graphing Density Looking at the graph finish this statement –As volume increases, the mass of oil ____________ increases