Threshold limit is the minimum limit at which changes occur. It can be judge by trail an error method. Like in case of photoelectric effect, it is the minimum frequency or energy at which photo electron emission takes place, which is judge by injecting frequency or energy of radiation. Slowly, slowly increase the energy and see where the changes occur, or where the electron emission takes place.
In case of chemical reaction, we add the chemical slowly and check where the changes occur first which is the threshold limit of adding chemical. Means the minimum amount of chemical to be added at which changes occur is the threshold limit of that chemical
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