Experimental physics tries to gain qualitative and quantitative insights into physical processes using planned scientific tests carried out in exactly the same way in reproducible and interference-avoiding conditions. An important prerequisite of experimental physics is the repeatability of the experiments. This alone can guarantee objectivity of statements. On the one hand, experimental physics acts as an engine for theoretical physics, given the fact that surprising experimental results must be integrated in the intellectual edifice of physics. On the other hand, experimental physics is driven by theoretical physics, as new theories must always be tested in order to develop their obviousness, borders and relationships.