Liquid metals can flow freely like water at relatively low temperatures, thus changing the perception of metals as solid. Taking gallium (Ga) as an example, hold it in your hand for a while and, interestingly, it melts and turns into a silvery drop that rolls around in your hand. More interestingly, it can be encapsulated in carbon tubes to form the smallest thermometer in the world. This kind of fascinating materials bring people into a new world. Nowadays, liquid metals are emerging as a new cutting-edge material in the frontiers of science and technology and nurturing a revolution in both fundamental discovery and unconventional applications.
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