Volume change when liquid goes to solid.

AI Thread Summary
To derive an equation for the volume increase when a liquid like water transitions to ice, one must consider the density change at the phase transition. The enthalpy of fusion and the pressure-temperature (PT) diagram are crucial for estimating this change. The slope of the PT diagram indicates how entropy changes during the transition, which, along with the transition temperature and specific heat of fusion, helps calculate the energy involved in the volume change. Understanding these thermodynamic principles is essential, though they can be complex for those not well-versed in the subject. A thorough examination of specific material properties is recommended for accurate predictions.
ladil
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Hello!

I need some help regarding a simple matter...

How do I derive an equation for the increase in volume when a liquid goes to a solid state when I know the density of the liquid?
 
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Most liquids reduce volume when they become solid. Water is one of the very few exceptions. Between the enthalpy of fusion and pressure-temperature diagram, you might be able to get an estimate, but generally, density change at phase transition is something you need to look up for specific material.
 
ok. Thanks for the help. Ill check it out.
Lets say it is water that becomes ice. Is there any easy way to derive an equation for predicting the increase in volume?
 
The slope of the PT diagram should tell you how much the entropy changes at transition, and knowing transition temperature and specific heat of fusion, you should be able to figure out how much energy goes into volume changed at given pressure, which should give you the density change. But I'm having a bit of trouble deriving this. Sorry, thermodynamics has never been my strong field.
 

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