Pressure, volume, and temperature

AI Thread Summary
The discussion revolves around calculating the volume ratio of steam to liquid water at specific conditions. Participants suggest using the density of steam and water to determine the volumes, with references to resources like the Handbook of Chemistry and Wikipedia. The ideal gas law is mentioned as a potential method for calculating the steam's volume, though there is some skepticism about treating water as an ideal gas. The conversation highlights the difference in approaches between basic physics and advanced thermodynamics. Ultimately, the focus is on finding the correct method to solve the problem based on the given parameters.
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Homework Statement



What is the ratio of the volume occupied by 300C steam at 1.0 atm pressure to the volume occupied by an equal mass of liquid water?

Homework Equations



P1V1/T1=P2V2/T2 ??

The Attempt at a Solution



not sure where to start
 
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Can you look up the density of steam at that temperature and pressure?
I think the Handbook of Chemistry has such a table. Or try Wikipedia.
 
No, no, Delphi, that is not in the spirit of Physics. What are you, an engineer? ;-)

Actually, you want to look at the density of water. Fairly easy. From water's density, determine the volume of a given mass.

Depending on the level of your physics class, you might be able to treat steam as an ideal gas. If so, use the ideal gas law to determine the volume of the steam.
 
an engineer?
Oh, no! I don't know if I would trust water to be an ideal gas, though. Maybe we need a chemist!
 
Delphi51 said:
Oh, no! I don't know if I would trust water to be an ideal gas, though. Maybe we need a chemist!

In freshman physics books there are dozens of questions which tell you to "treat the [whatever] as an ideal gas." In advanced thermodynamics, you need to add the specific qualifying ratios, but this didn't sound like an advanced level question.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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