We have to calculate the force (in pounds) on the surface of a can from which all of air is sucked our using a vacuum pump.

When the can is emptied, the *pressure on the can will be the atmospheric pressure*. We can calculate the force on its surface using this formula:

$\overline{){\mathbf{Pressure}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{Force}}{\mathbf{Area}}}$

**We will now follow these steps to solve this problem:**

**Step 1:** Calculate the total surface area of the can.

**Step 2:** Calculate the surface area to in^{2} units.

**Step 3:** Calculate the force in pounds.

An ordinary gasoline can measuring 30.0 cm by 25.0 cm by 20.0 cm is evacuated with a vacuum pump.

Assuming that virtually all of the air can be removed from inside the can, and that atmospheric pressure is 14.7 psi, what is the total force (in pounds) on the surface of the can?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Pressure Units concept. You can view video lessons to learn Pressure Units. Or if you need more Pressure Units practice, you can also practice Pressure Units practice problems.