change colour depending on their temperature. ‘Thermo’ means heat and ‘chromic’ means colour.
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Phosphorescent materials
sometimes referred to as ‘glow in the dark’, absorb light energy during the day and then they are able to give this energy off at night, or at very low levels of light, for example Fire Exit signs
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Photochromic materials
change colour in response to changes in light levels hitting the surface eg; light sensitive sunglasses
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Hydrochromic materials
change colour depending on the amount of water applied,
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Electrochromic materials
change colour depending on the amount electrical input, which can be very small but the change in colour can be dramatic.
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Modern materials
developed through the invention of new or improved processes, for example, as a result of 'man' made materials/ingredients or human intervention, in other words not naturally occurring changes. They are altered to perform a particular function
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Smart materials
designed materials that have one or more properties that can be significantly changed in a controlled fashion by external stimuli,
sometimes referred to as ‘glow in the dark’, absorb light energy during the day and then they are able to give this energy off at night, or at very low levels of light, for example Fire Exit signs
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