Question

what is a constant variable in the following experiment how many drops of water can fit onto a penny dipped in soap vs a not dipped in soap?
the number of drops of water
the penny dipped in soap or not
the pipette used to drop water onto the penny

Explanation:

In an experiment, a constant variable is one that is kept the same throughout. The pipette used to drop water should be the same to ensure consistency. The number of drops is the dependent variable, and the penny being dipped in soap or not is the independent variable.

Answer:

The pipette used to drop water onto the penny