What Is the Value of g in the Pressure Calculation Formula?

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SUMMARY

The discussion centers on calculating the absolute pressure at a height of 6 meters in a cylindrical tank filled with water. The atmospheric pressure is given as 1.01 x 105 Pa, and the density of water is 1000 kg/m3. The formula used is P = Pa + ρgh, where g represents the acceleration due to gravity, typically valued at 9.81 m/s2. The pressure at 6 meters is derived from the atmospheric pressure plus the hydrostatic pressure from the water column above that point.

PREREQUISITES
  • Understanding of hydrostatic pressure principles
  • Familiarity with the formula P = Pa + ρgh
  • Knowledge of the density of water (1000 kg/m3)
  • Basic understanding of atmospheric pressure (1.01 x 105 Pa)
NEXT STEPS
  • Research the value of gravitational acceleration (g = 9.81 m/s2)
  • Explore hydrostatic pressure calculations in different fluids
  • Learn about the effects of atmospheric pressure on fluid systems
  • Investigate applications of pressure calculations in engineering contexts
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Students studying fluid mechanics, engineers involved in pressure systems, and anyone needing to understand hydrostatic pressure calculations.

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Homework Statement



Cylindrical tank of water is 20m tall, and full. atmospheric pressure is 1.01x10^5 Pa and the density of water is 1000Kg/m^3. Find absolute pressure 6m above the bottom.

Homework Equations



P=P*sub*a + pgh

The Attempt at a Solution



I got so far... P=(1.01 x 10^5) + (1000)g(6)
How do i find g?what is g??
 
Last edited:
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Isn't g gravity? Which is a given constant most of the time.
 
P=(1.01 x 10^5) + (1000)g(6)

u're finding the pressure exerted by 6m of water?
 
xiankai said:
u're finding the pressure exerted by 6m of water?
Good point. The water tank is 20 m high and the gauge is 6 m above the base so how many meters below the water line is it?
 

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