If you read this, it will make things clear. Temperature can be both as it depends on how you are using it in your experiment. How_do_you_identify_independent_and_dependent_variables
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Dependent variable: growth of crystals Independent variable: temperature.
A dependent variable depends on the independent variable. If you are doing an experiment about how temperature affects the heat of water then the independent variable would be the temperature, as that is what you are going to change, and the dependent variable the water as the temperature of the water depends on the temperature surrounding it.
The Temperature is the Independent Variable (50 degrees, 100 Degrees etc.) Whatever happens as a result of the temperature change is the dependent variable.
Independent variable is time; dependent variable is temperature.
That the surface tension of water varies with the water's temperature. In this case, temperature would be the independent variable and surface tension would be the independent variable.