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indicator

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indicator

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The pH levels of some common substances. The lower the pH, the more acidic the substance; the higher the pH, the more alkaline the substance.

In chemistry, a compound that changes its structure and colour in response to its environment. The commonest chemical indicators detect changes in pH (for example, litmus and universal indicator) or in the oxidation state of a system (redox indicators).
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The latter had an ivory plate bearing "statoscope" and other words in French, and a little indicator quivered and waggled, between Montee and Descente.
The War in the Air by Wells, H.G. View in context
The grouped letters stood out heavily black, around the pivot-head of the indicator, emphatically symbolic of loud exclamations: AHEAD, ASTERN, SLOW, Half, STAND BY; and the fat black hand pointed downwards to the word FULL, which, thus singled out, captured the eye as a sharp cry secures attention.
Typhoon by Conrad, Joseph View in context
Now, instead of reversing the levers, I had pulled them over so as to go forward with them, and when I came to look at these indicators I found that the thousands hand was sweeping round as fast as the seconds hand of a watch--into futurity.
The Time Machine by Wells, H.G. View in context
 
 
 
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