The definition of smart materials is any material with properties that can be significantly altered on demand by external stimuli. It is a huge field of cutting-edge research. The global market for smart materials in 2014 was $26 billion. By 2019 it is predicted to be $42.2 billion.
There are many ways in which smart materials can be manipulated and just as many stimuli that can manipulate them. The potential number of applications that this leads to is rather exciting: self-healing glass, the replacement of motorized components, armour that gets stronger in accordance with the impact
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