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Indicator Definition. A chemical indicator is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a color change, precipitate formation, bubble formation, temperature change, or other measurable quality.
An indicator is a chemical compound that changes colour and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is â¦ an indicator that becomes red in the presence of acids and blue in the presence of bases.+ 19 others found this useful. MikizuNg Vasabi.ndicator is a process which is used to find out the substanceis acid,base and salt. example: litmus paper and termuric both are natural indicator. example of artificial indic â¦ ator: mithyl orange and phenolphtaceil. 4 people found this useful.