Make a pitcher of colored water. Using colored water will make it easier to determine where the bottom of the meniscus is, thus a more accurate reading. Remember, whether using a graduated cylinder or a liquid measuring cup, always read the volume at eye level. Make a data table for three trials, each will contain different volumes. The data table should have a column for estimated volume, and another column for actual volume, for each container.
Line the liquid containers in a row, and pour the colored water into all three, making sure the liquid levels appear to be equal. This is your Trial 1, and will contain the greatest amount of water.
Estimate the volume of water for all three containers in milliliters, placing them in your data table. Your estimate should be in accordance to either the graduated cylinder's or measuring cup's precision. Remember, from your previous lessons, you are allowed to go one uncertain number past the markers on the instrument.
Carefully pour the water into the graduated cylinder or the liquid measuring cup. At eye level read the volumes, but remember to go one uncertain number past the markings on the instrument.
In your data table, put the volume for each container in milliliters. If your liquid measuring cup does not have a metric scale, then use the conversion 1 cup = 237 mL. For example, if the line on the liquid measuring cup reads at a half cup, then multiply 237 mL by 0.5 to equal 118 mL.
For Trial 2, repeat the steps 3 through 6, making sure that the volume is less than Trial 1.
For Trial 3, repeat the steps 3 through 6, making sure that the volume is less than Trial 2.
Once you have completed the exercise, transfer your data table into a report for your teacher to grade.