Biophysics is an interdisciplinary research area between physics and biology. Living nature and biological phenomena can be explored using the principles and methods applied in physics. For example, the theory of an electric circuit can be used to describe how signals are transmitted in the brain, and the laws of thermodynamics in physics can explain how nerves function and how sedatives act in the nerve cells.

Biologists and physicists often conduct joint research projects in this field. The biologists often perform the experiments, and the physicists calculate the mathematical equations and models that provide an overview and explain the processes that occur at molecular level.