# Cylinder thermodynamic problem

jdbp2

## Homework Statement

A cylinder has a well fitted 2.0 kg metal piston whoe cross sectional area is 2.0 cm2 The cylinder contains water and steam at constant temperature. The piston is observed to fall slwoly at a rate of 0.30 cm/s because heat flows out of the cylinder through the cylinder walls. As this appehns some steam condenses in the chamber. The density of the steam inside the chamber is 6.0x10-4 g/cm3 and the atmospheric pressure is 1.0 atm Calculate the rate of condensation of steam? At what rate is heat leaving the chamber? What is the rate of change of internal energy of the steam and water inside the chamber?

## The Attempt at a Solution

lalbatros
jdbp2,

First question:

Why is the piston falling?

jdbp2
I have no idea why the piston is falling. I am guessing it has to do with the change in volume in the cylinder from the condensation.

denverdoc
it says in the question because "heat flows out..." 2 questions: how are pressure, volume and temperature related. When water condenses is heat gained or lost? How much? See if you can find some eqns which you may already know, and post them in the relevant eqns section.