What's the difference between a constant and a controlled variable?

A constant is something that will ALWAYS remain the same in your experiment. For instance, the materials you use and the unit of measurements you use are examples of constants. Controlled variables are what you are using in order for you to compare your results.





So for example, you want to test how soil affects plants. Your control could be 50% soil. You will then use 100% soil and 0% soil and compare these to the 50% soil to see if less or more soil will affect the plant. You know what I'm saying?What's the difference between a constant and a controlled variable?
A constant is a variable that remains the same though out the entire experiment. A controlled variable is a variable in an experiment that you change. For instance, if you where trying to see what would burn more calories, running vs jogging for 10 minutes, running and jogging would be controlled variables, while the 10 minutes is a constant. What's the difference between a constant and a controlled variable?
In an experiment, a constant is the parts of the experiment that you keep the same throughout regardless of your variables. The controlled variable usually has something to do with time, and it would be like the time part of the experiment took.


Hope this helps, I'm not sure if this is right for your situation or not, though.