Question

Estimate the number of impacts that air molecules make with the palm of your hand each second, assuming that all air consists entirely of nitrogen (molar mass=0.028kg)?

Answer 1

Force= pressure$\times$ area

Force = number of hits mass change $\times$ velocity Change

Number of hits =$\frac{air pressure\times A}{m}$

Number of hits =$\frac{1 atm \times A}{0.028}$