Mercury is a better barometer fluid than water because
l. It needs no colouring
ll. Its density is many times greater than that of water
lll. It does not wet glass
IV. It has a high vapour pressure
V. It has a high boiling point
Which of the above statements are true?
A. I and II only
B. I,II and III only
C. III and IV only
D. IV and V only
E. III, IV and V only
ANSWER: Option B
EXPLANATION: Those characteristics of mercury worth noting down as questions may come in another format in your next exam.
Also note, the reason mercury doesn’t wet glass is because mercury has a high cohesive force.
Cohesive force: is the force of attraction between molecules of the same kind
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