Liquid metal imbalance of the surface tension induces a pressure difference between the rear and the head, which produces a thrust to drive the droplet toward the head; at the same time, the hydrogen produced in the electrochemical reaction process also further raises the thrust. The discovery of this phenomenon laid the technical foundation for the development of intelligent motors, vascular robots, fluid pumping systems, flexible actuators and even more complex liquid metal robots. Liquid metal Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be
External (mathematics) External (mathematics) The term external is useful for describing certain algebraic structures. The term comes from the concept of an external binary operation which is a binary operation that draws from some "external set". To be more specific, a left external binary operation on "S" over "R" is a function formula_1 and a right external binary operation on "S" over "R" is a function formula_2 where "S" is the set the operation is defined on, and "R" is the external set (the set the operation is defined "over"). The "external" concept is a generalization rather than a specialization, and as