During an experiment, ice and water were placed in a perfectly insulated thermos flask at 0 °C. Describe this system when it phase reaches equilibrium.

At equilibrium state, the water will have turned into ice.

Explanation:

An Equilibrium phase is defined as a stage when chemical potential of any component ( solid liquid or gas) present in the system remains steady with time. So, in this situation, because the system is perfectly insulated, no heat will be gained or lost. The water and ice are both at exactly 0 °C, then that temperature will remain constant. As time goes on, the water will freeze and the system will become all ice.

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.