1. Students in another science class had a sealed plastic bag full to decide whether the air in the bag had mass. Here are the answers that four,
students wrote:
a. Air does not have mass because the bag does not feel heavy.
b. Air does not have mass because the air keeps moving around.
c. Since I cannot actually measure it, air cannot have mass,
d. Air has mass, but it is probably very, very small.
Which of these answers do you agree with? Explain your ideas. If you do not agree
with any of the answers, what answer would you give instead?

the correct answer to this question is 2

answersilicon (si); oxygen (o);

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.