We would love to be able to accommodate individual students or lab groups but prior experience has shown that the data is easier to analyze when students average their results together and report one set of data per class. It also helps to offset any particular thermometer error when many students average their boiling points together. It is important that all students in the same class to use the same volume of water for the experiment because averaging of many different volumes of water will not make it easy for students to see if there is a correlation between boiling point and volume of water. It is also important that all students in the same class use the same heating device because there is no way to enter separate heating devices for all students or lab groups. Each class should use the same volume of water and same heating device for all three days of the experiment.
Different classes can use different volumes of water and different heating devices.
For example, Chemistry Period 1 can use 500 mL of water and hot plates for each day of the experiment and Chemistry Period 2 can use 375 mL of water and bunsen burners for each day of the experiment. It is very important that you use distilled water and not tap or spring water. Distilled water may also be labeled demineralized water and this is fine to use. If possible, try to find the exact elevation of your classroom. The school elevation might be on school blueprints or a local topographic map.