Projects that incorporate magnetic levitation include transportation engineering projects, such as magnetically levitated trains, environmental engineering projects, such as wind turbines, and biomedical engineering projects, such as heart pumps. Magnetic levitation refers to suspending an object with magnetic fields to negate gravity.
Magnetically levitated trains suspend themselves above the tracks using a magnetic field to eliminate friction, achieve higher speeds and offer a safe method of transport. Magnetic levitation technology introduced in classical heart pumps created a smaller device with low power usage and an extended reliability. Special sensors use magnetic levitation to suspend liquids in the air and measure the density and content. The first patent for a "levitating transmitting apparatus" was given to Emile Bachelet in 1912.