27.04.2016 Views

Callister - An introduction - 8th edition

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Chapter 10 Phase Transformations:<br />

Development of Microstructure and Alteration of Mechanical Properties<br />

Pressure<br />

Solid<br />

(Ice)<br />

Two pressure-temperature phase diagrams are shown: for H 2 O (top) and CO 2 (bottom).<br />

Phase transformations occur, when phase boundaries (the red curves) on these plots are<br />

crossed as temperature and/or pressure is changed. For example, ice melts (transforms to<br />

liquid water) upon heating, which corresponds to crossing the solid-liquid phase boundary,<br />

Liquid<br />

(Water)<br />

as represented by the arrow on the H 2 O phase<br />

diagram. Similarly, upon passing across the solid-gas<br />

phase boundary of the CO 2 phase diagram, dry ice<br />

(solid CO 2 ) sublimes (transforms to gaseous CO 2 ).<br />

Again, an arrow delineates this phase transformation.<br />

(Melting ice: SuperStock; dry ice: Charles D.<br />

Winters/Photo Researchers, Inc.)<br />

Temperature<br />

Vapor<br />

(Steam)<br />

Solid<br />

Liquid<br />

Pressure<br />

Gas<br />

Temperature<br />

342 •

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!