An electric bulb of volume 250 cc was sealed during manufacturing at a pressure of 10−3 mm of mercury at 270C. Compute the number of air molecules contained in the bulb. Avogadro constant= 6 × 1023 mol−1, density of mercury = 13600 kg m−3and g = 10 m s−2.
A solid block weighs 20 kg . Its volume is found to be 4000 cc. Find its density in g/cc and in kg/m^3.