research into questions posed by scientific theories and hypotheses

a standard against which other conditions can be compared in a scientific experiment

the procedure that is varied in order to estimate a variable's effect by comparison with a control condition

to conduct a test or investigation

the act of subjecting to experimental test in order to determine how well something works

experimenting until a solution is found

a celebrated experiment conducted by Albert Michelson and Edward Morley; their failure to detect any influence of the earth's motion on the velocity of light was the starting point for Einstein's theory of relativity

an experiment designed to control for variables affecting the results of another experiment

a standard against which other conditions can be compared in a scientific experiment

the procedure that is varied in order to estimate a variable's effect by comparison with a control condition