The mole and Avogadro’s number are now almost synonymous with each other. We say that one mole of a substance is the amount that contains Avogadro’s number of particles. However, both concepts were developed independently at different times. Analyze the theories and definition of both of these concepts. Then, explain why it is correct to define a mole in terms of Avogadro’s number and vice versa.

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.