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# fluid mechanics

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1. I don't know where else to post this

From measurements taken on the variation of pressure with depth in a liquid, it was found that, on a certain day, 2m below the surface of a given liquid, the absolute pressure was 1.17 x 105N/m2, while at a depth of 5m the absolute pressure was 142kN/m2. Find a) the relative density of the liquid

what formula can i use
2. (Original post by cushticwarrior)
I don't know where else to post this

From measurements taken on the variation of pressure with depth in a liquid, it was found that, on a certain day, 2m below the surface of a given liquid, the absolute pressure was 1.17 x 105N/m2, while at a depth of 5m the absolute pressure was 142kN/m2. Find a) the relative density of the liquid

what formula can i use
3. (Original post by langlitz)

1x10^5/(9.81*2)=5963 This is not the answer given. Do you know what I am doing wrong
4. (Original post by cushticwarrior)

1x10^5/(9.81*2)=5963 This is not the answer given. Do you know what I am doing wrong
5. (Original post by langlitz)
0.8 something, relative density.
6. (Original post by cushticwarrior)
0.8 something, relative density.
You need to use the difference in pressure and the difference in height: ΔP = ρgΔh
7. Thank you!

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