what is indicator? explain
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Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.
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something that gives information or shows something; a sign
कुछ सूचित या प्रदर्शित करने वाली वस्तु; सूचक
The indicator showed that we had plenty of petrol.The indicator showed that we had plenty of petrol.
2.
the flashing light on a car, etc. that shows that it is going to turn right or left
कार पर लगी रह-रहकर चमकने वाली रोशनी (जो कार के दाएँ या बाएँ जाने का संकेत करती है)
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