Recognize blowing or clapping hands with microphone sensor(Arduino Uno)
Afaik you cannot check frequencies, so the only way to check is with the amplitude (volume) over time. 

A handclap reaches very fast a high volume, and afterwards decreases very fast.

A blow can be more various, if you give a very short/hard blow it might be similar.

So you have to check against 'profiles' and the one (blow or handclap) which matches should be assumed to use.

To make it more difficult, hand claps can vary also in length if there is reverb/eche. Also background noise can be a problem.