Fair Test

Fair Testing

A Fair test is an experiment where one thing (a variable) is changed to see how it affects the results. A variable is something that could be changed. In a fair test all the variables remain the same except one.

All the variables that could be changed if you were to heat water in a beaker are:

Amount of water

Size of beaker

Amount of heat

Type of flame

Variable to be changed - Size of beaker, use 100 ml and 250 ml beaker

Variables to be kept the same:

Amount of water - use 100 mls of water

amount of heat - heat the beakers for the same amount of time 

Type of flame - use the blue flame on the bunsen

Independent variable is the variable that we want to change in an experiment.

Dependent variable is the variable that we measure or observe during the experiment.

All other variable are kept the same and are called the controlled variables.

Example: The height of bean plants depends on the amount of water they receive.

Independent variable (IV) - Amount of water

Dependent variable (DV) - The growth of the plant

Controlled variables (CV) - Amount of sunlight, type of bean plant, type of soil.