independent, change or compare, e.g different temperatures, e.g different volumes, e.g. different ingredients, first column in a results table, dependent, measure or record, e.g. record the froth height , e.g. time to reach a certain height, e.g. diameter of balloon, featured in a results table, repeats are taken to increase reliability, control, keep the same , lots of these = fair test, e.g same volume, same time etc., mentioned in the method, not the results table, aim for at least 3 of these variables.

variables

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