# Trying to figure out the density of water?

1. Sep 5, 2010

### dillonmhudson

1. The problem statement, all variables and given/known data
"A steel cylinder of mass 2 kg contains 4.0 L of liquid water at 25 degrees centigrade at 200 kPa. Find the total mass and volume of the system."

2. Relevant equations
I know that water at 4 degrees centigrade is approximately 1000 kg/m^3. But how about when it is pressurized and at 25 degrees centigrade?

3. The attempt at a solution

Thanks for any help.

2. Sep 5, 2010

### vela

Staff Emeritus
You typically have a table or chart in your textbook which has the required info.

3. Sep 5, 2010

### dillonmhudson

The questions are not from the textbook so the tables do not provide the required information.

4. Sep 5, 2010

### vela

Staff Emeritus
5. Sep 5, 2010

### dillonmhudson

Already been there. Didn't find anything.

6. Sep 6, 2010

### john.phillip

Try this chart, you might find a better one elsewhere:

http://www.engineeringtoolbox.com/fluid-density-temperature-pressure-d_309.html

To solve the problem:

What is the water density and, therefore, the water mass ?
Can you now tell the combined mass ?
What do you have to know to estimate the volume of the steel cylinder ?
Can you approximate the steel cylinder height and inner diameter ?
What about the outer diameter ?
What will be the combined volume ?

Last edited: Sep 6, 2010