What is a constant in an experiment?
A constant in an experiment is a factor that is kept the same for all groups and all trials. Keeping constants unchanged helps ensure that any measured change in the outcome is caused by the independent variable, not by other conditions.
What you are being asked
You need to define what a “constant” means in experimental design and explain why it matters for drawing a fair conclusion.
What a constant is
A constant is any condition or factor that does not change during the experiment. It stays the same for every experimental group and the control group.
Why constants matter
If other factors change along with the independent variable, you cannot tell what actually caused the result. By holding constants steady, you make the test “fair” so differences in the dependent variable can be linked to the independent variable.
Quick example
Suppose you test how fertilizer amount affects plant height.
- Independent variable: fertilizer amount
- Dependent variable: plant height
- Constants: plant species, soil type, pot size, amount of water, light exposure, temperature, and length of growth time
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