Part 2: Identify the independent, dependent, and constant variables Experiment 1: A soap manufacturer runs an experiment to compare the foaming action of different dish detergents. Equal

amounts of each brand of detergent are placed in identical containers half-filled with water. The water and dish detergent are at

a temperature of 20°Celsius. Each container is agitated for 30 seconds, and then the height of the foam is measured.

a. independent variable:

b. dependent variable:

C. constant variable(s):

ANSWER:

IV, Type of dish detergent. DV, height of foam. CV, type of container, amount of water in container, temperature of water, time the container is agitated.

Explanation:

Independent variable(IV)- what you change during the experiment.
dependent variable(DV)- what you're measuring during an experiment. The dependent variable is DEPENDENT because it's results DEPEND on the independent variable at play.
Constant variables(CV)- things that do not change in order to isolate the tested variables as much as possible.

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