Figure 5.1 shows a picture of a barometer. Which of the following statements is the best explanation of how this barometer works?

a. Air pressure outside the tube causes the mercury to move in the tube until the air pressure inside and outside the tube is equal.

b. Air pressure inside the tube causes the mercury to move in the tube until the air pressure inside and outside the tube is equal.

c. Air pressure outside the tube counterbalances the weight of the mercury in the tube.

d. Capillary action of the mercury causes the mercury to go up the tube.

e. The vacuum that is formed at the top of the tube holds up the mercury.

Justify your choice. For choices that you did not pick, explain why they are incorrect. Pictures help!

Transcribed Image Text:

FIGURE 5.1 Vacuum h = 760 mm Hg for standard atmosphere