|
| |
|
|
|
|
|
|
|
|
|
ice |
|
| |
|
The solid phase of water. Water is the only substance that has different names for all three of its phases. Ice is almost unique in that its density is less than that of liquid water. Nevertheless, this is vital for life on Earth: as ice floats on water, ponds freeze downwards from the top and aquatic life can survive. Its low density is caused by strong hydrogen bonding, which holds the oxygen atoms in an open structure (see the diagram opposite; hydrogen bonds are conventionally indicated by dashed lines). At very high pressures phase changes occur, to give other crystal structures (distinct from normal ice); these are labelled by roman numerals, as in ice II.
{img src=show_image.php?name=image_09_02.gif } |
|
|
|
|
Bookmark this page:
|
|
|
|
<< former term |
|
next term >> |
|
|
|
|
|
| |
|
|
| Other Terms : dry ice | volumetric analysis | Pauli (exclusion) principle
|
| |
|
Home |
Add new article |
Your List |
Tools |
Become an Editor |
Tell a Friend |
Links |
Awards |
Testimonials |
Press |
News |
About
| Imprint |
|
Copyright ©2009 Globalscience24. All rights reserved. Terms of Use | Privacy Policy | Contact Us
|
