Question

based on the data gathered, we measured the boiling point of water as 99.51 degrees celsius. the error against the expected measurement was 0.49 percent. sources of error may have been impurities in the water, contamination of the equipment, or human error in reading the thermometer. if we repeated the experiment, we might achieve more accurate results by sterilizing our equipment, using distilled water, and verifying that the thermometers readings are correct.
what is the texts main purpose?
to convince readers that the boiling point of water is 99.51 degrees celsius
to record an experiment and demonstrate learning
to inform readers about water impurities
to suggest that accurately reading a thermometer is an important skill

Explanation:

The text describes an experiment (measuring water's boiling point), notes the result, error, sources of error, and how to improve results. This shows it records an experiment and demonstrates learning. The first option is wrong as it's an experimental result with error. The third and fourth options are too narrow; the text isn't just about water impurities or thermometer - reading.

Answer:

to record an experiment and demonstrate learning