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## Homework Statement

A test tube standing vertically in a test-tube rack contains 2.5cm of oil (Density=0.81 g/cm^3) and 6.5cm of water. What is the pressure on the bottom of the test tube?

## Homework Equations

P=F/A

P=Dhg where d=density, h=heigh, and g=gravity.

## The Attempt at a Solution

P=(0.81)(9cm {2.5cm+6.5cm})(9.80)

P=71.442 Pa

Is this correct?