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How can one find whether or not there is enough oxygen for breathing present inside a (dry) well of diameter 1m at depth of 50m?

Many people in Nepal are killed during cleaning wells because of lack of oxygen..

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If I understand you correctly, you want to ask if there is free oxygen for breathing present deep in a dry well, right? –  ManishEarth Jan 19 '13 at 12:23
    
If this is for an actual application, please use whatever answer you get as a starting point for a consultation with an expert on such matters. –  jonsca Jan 20 '13 at 1:48
    
is this a theoretical problem or practical one, the data seems as if it is for theoretical purpose. –  Aditya Sriram Jan 20 '13 at 4:03
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1 Answer

The ideal solution would be a single gas personal detector, such as this one (it's only the first example I found, I don't know this brand, but there are many equivalent apparatuses from other vendors).

While digital personal detectors are expensive ($200+ range), there are simpler systems which also provide some basic safety (better than nothing). The Davy lamp is perhaps the best known example of these, and it was a huge breakthrough in mine safety when it was popularized after 1815.

Davy lamp

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