What is a variable in a science fair?

Answer 1

I am also doing a science expo right now! The variable can be two things. The independent/manipulated variable is the info u already know. For instant, if u were testing which brand of balls bounced the highest, the types of balls would be the independent variable. The dependent/responding variable is the info u want to find out. For example, in the ladder experiment, the dependent variable would be how high each ball bounced when u tested it. I hope that helps!! =)

Answer 2

Scientists use an experiment to search for cause and effect relationships in nature. In other words, they design an experiment so that changes to one item cause something else to vary in a predictable way.
These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only one independent variable. As the scientist changes the independent variable, he or she observes what happens.
The scientist focuses his or her observations on the dependent variable to see how it responds to the change made to the independent variable. The new value of the dependent variable is caused by and depends on the value of the independent variable.

Answer 3

The variable is the thing that you change in your experiment. ex. if you were doing an experiment on what type of mentos make the highest explosion when dropped in coke your variable would be the type of mentos

Answer 4

the variable is the plausbility of the thesis statement and the cosmetics

Answer 5

a dependent variable is the one you measure, the control variables (multilpe of these) are the ones you keep the same and the independent is the one you change.