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QUESTION

# What's the difference between a control, constant, dependent and an independent variable?

Controlled variable rArr have nothing done to it. Constant variable rArr kept the same Dependent variable rArr you observed/measured Independent variable rArr changed

Lets take this scenario, you want to find out how the volume of water watered can affect the growth of the bean sprouts .

So you have 2 pots for this experiment, Pot A and Pot B. With Pot A having a usual volume of 50ml watered every time, and Pot B having a higher than usual volume of 100ml watered every time.

Independent Variable: The variable that you changed.

• In this case is the volume of water watered .

Dependent Variable: The variable that you observed/measured.

• In this case is the height of the bean sprout .

Constant Variable: The variable that is kept the same throughout the experiment.

• In this case are:

• Type of Pots used

• Number of Seeds planted
• Temperature of the surroundings
• Time at which the plants are watered

Of course, there are other variables that should be kept constant, the above 4 are just examples.

Controlled Variable: The variable that have nothing done to it.

• In this case it refers to Pot A , which is the usual pot, no independent variable existed as the volume of water have no change (usual 50ml).