Calculate the heat (in joules) absorbed by the system for each of the following examples (the system is given in italics). Specify the sign of the heat. a. 100g of liquid water is heated from 0°C to 1000°C at 1 bar
b. 100g of liquid water is frozen to ice at 0°C at 0.01 bar
c. 100g of liquid water is evaporated to steam at 1000°C at 1 bar

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.