Wax. > A wax motor is a linear actuator device that converts thermal energy into mechanical energy by exploiting the phase-change behaviour of waxes.[1] During

Wax. > A wax motor is a linear actuator device that converts thermal energy into mechanical energy by exploiting the phase-change behaviour of waxes.[1] During melting, wax typically expands in volume by 5–20% https://en.wikipedia.org/wiki/Wax_motor https://en.wikipedia.org/wiki/Wax_motor