What is a variable and a control?

Answer 1

Without a control and variable you can not say what caused any results, and you can not know if the results would have been the same without factors from the experiment. You need a control and variable for comparison purposes also.

Answer 2

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.

Experiments also have controlled variables. Controlled variables are quantities that a scientist wants to remain constant, and he must observe them as carefully as the dependent variables. For example, if we want to measure how much water flow increases when we open a faucet, it is important to make sure that the water pressure (the controlled variable) is held constant. That's because both the water pressure and the opening of a faucet have an impact on how much water flows. If we change both of them at the same time, we can't be sure how much of the change in water flow is because of the faucet opening and how much because of the water pressure. In other words, it would not be a fair test. Most experiments have more than one controlled variable. Some people refer to controlled variables as "constant variables."

Answer 3

Variables are things such as temperature, pressure, concentrations etc and an alteration of any of these effect an experiment. For example if you place a piece of Magnesium in the open air nothing much wil happen even over a long period of time. However if you heat the Magnesium sufficiently it will then burn in the presence of the Oxygen in the air, with a brilliant white flame. The end result will be a the production of Magnesium oxide which is a greyish/white power.

Answer 4

Control means a factor which remains the same and doesn't change while variable is the other thing which can vary according to situation.

Answer 5

By finding a new answer experimenting again.

P.s this question was in my test as well.

Answer 6

it will change the outcome of comparibles.

Answer 7

The effect of using both a variable and a control in any experiment is simple. You will have one thing that isn't tested on and one that is so that you can see the difference.

Answer 8

The variables make the experiment more controlled