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==Key Stage 3==
===Meaning===
An [[experiment]] is a type of scientific [[investigation]] in which you test a [[hypothesis]] by changing a single [[variable]] to see how it affects another [[variable]].
===About Experiments===
: In an [[experiment]] the [[variable]] which is deliberately changed is known as the [[Independent Variable]].
: In an [[experiment]] the [[variable]] which is [[observed]] or [[measure]]d is the [[Dependent Variable]].
: An [[experiment]] which is a [[Fair Test|fair test]] will have all the other [[variable]]s [[Control Variable|controlled]] to make sure nothing else has affected the [[result]]s. For example you cannot find out whether a [[plant]] grows faster in direct sunlight or shade if you decide to only water one of the [[plant]]s.