MEMS is a very unique form, and the difference from electronics and mechanics is important to use MEMS correctly. Compared with traditional mechanical devices, MEMS have a larger surface area to volume ratio, and the forces generated by electrostatic charges and magnetic moments are also more important. At the MEMS scale, fluid dynamics such as surface tension and viscosity are important design considerations for many systems. In contrast to molecular electronics or nanotechnology, MEMS generally do not need to consider surface chemical states. MEMS technology can be used in a range of devices from pumps to inductors. Switching technology is a good example of a basic MEMS implementation that can use resistive or capacitive designs.