What are the three factors that keeps the experements fair in science.?

Question

for example: the amount of time......etc.

Answer 1

If everything is the same except the independent variable because that is the only thing which you will change so everything else such as the temperature,volume of water,place and the amount of time

Answer 2

Does the project do a good job of illustrating a fundamental principle of science?  IE, magnetism, or alternating vs. direct current, or cell division, vs. creationism, astrology, etc?

Did the student do the work themself?

Did the student follow established guidelines - are they within budget, do they use only the space allotted, does the exhibit convey the principle clearly, does it not use any dangerous substances (gasoline or other flammable objects, for example)

Answer 3

It all depends on the experiment here are sometimes more than 3 and sometimes less than 3