A collapsible balloon for carrying meteorological testing instruments aloft is partly filled with 626 liters of helium, measured at 25 °C and 756 torr. Assuming the balloon is free to expand or contract according to changes in pressure and temperature, what will be its volume at an altitude where the temperature is 58 °C and the pressure is 0.641 atm?

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.