MadSci Network: Physics Query:

### Subject: Calculating water (or is it air) pressure versus temperature

Date: Mon Feb 28 01:50:36 2005
Posted by Darrell
Grade level: nonaligned School: No school entered.
City: Santa Clara State/Province: CA Country: United States
Area of science: Physics
ID: 1109577036.Ph
Message:
```
I have a 2 liter plastic coke bottle half filled with water, the other half
filled with air. A flexible straw is inserted into the top and the top is then
sealed. The end of the straw in the bottle is at the bottom of the bottle in
the water and the other end of the straw is over a measuring cup.
Here are my questions:
1) Can you show me a formula and an example of how to calculate the amount of
water pushed out of the bottle when the temp. of the air inside of the bottle
is raised by 10 and 20 deg. C?
2) Does the amount of air in the bottle matter? for example 3/4 air -1/4 water
or 1/4 Air 3/4 water?

```

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