What would be a control group if the independent variable is temperature?

I know ideally it would be no temperature, but since thats not possible, do i just make it room temperature? But what if room temperature was one of the temperatures i was testing at?|||If your experiment was looking at the effect of temperature on enzyme activity then a control would be a tube with no enzyme in for each different temperature.|||An experiment which uses controls is called a controlled experiment, and usually separates research subjects into two groups: An experimental group and a control group. The control group is practically identical to the treatment group, except for the single variable of interest whose effect is being tested.





examples:


In testing a drug, it is important to carefully verify that the supposed effects of the drug are produced only by the drug itself. Physicians achieve this with a double-blind study in a clinical trial: two (statistically) identical groups of patients are compared, one of which receives the drug and one of which receives a placebo. The group receiving the placebo would be the control group, while the group receiving the drug would be the treatment group. Neither the patients nor the doctor know which group receives the real drug, which serves both to curb bias and to isolate the effects of the drug.


In experiments involving a surgical procedure, a sham operated group is used to ensure that the data reflect the effects of the experiment itself, and are not a consequence of the surgery.


In experiments where crop yield is affected (e.g. soil fertility), the experiment can be controlled by assigning the treatments to randomly selected plots of land. This mitigates the effect of different soil composition on the yield.|||maybe could you be more specific? controls vary throughout experiments.





I suggest changing one of your other variables as the control, depending on the nature of your experiment.