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How do sensors work? I need slightly technical information?

I'm doing this paper on wireless monitoring and I really need to know how sensors basically work and more specifically how temperature ,pressure ,light,radiation, force and toxic gas sensors work. I'm not an electronics student. So an extremely simple


It is a HUGE field, so you will have to do some web searching. Manufacturers pages are usually good places to find explanatory info.

Temperature:
Thermocouple - makes use of the fact that a junction of 2 different metals produces

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