Water and Mercury Pressure

  • Thread starter Gear2d
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  • #1
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Homework Statement


If you have two containers one with water (filled to 10cm) and one with mercury (5cm), how do the pressure of water and mercury compare?

p of water = 1 gm/cm^3
p of mercury = 14 gm/cm^3

Homework Equations



P = pgh where p is density, and h is height

The Attempt at a Solution



P water = (1)(10) = 10 (I am not include gravity since its the same for both and they are only looking for a ratio)

P mercury = (14)(5) = 70

Would the correct answer be: 7*Pwater = Pmercury ?
 
Last edited:

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
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Correct, although if they were looking for the RATIO of total pressure at the bottom of the two containers then you do have to consider the air pressure.
70 / 10 is not quite the same as 70+atm / 10+atm (ps. 1 atm is roughly 1000g/cm^2)
The DIFFERENCE between the pressures doesn't depend on the atmosphere.
 

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