Are degrees of freedom in a molecule affected by phase change?

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SUMMARY

The discussion confirms that the degrees of freedom for a water molecule remain unchanged during phase transitions between solid, liquid, and gas states. Each water molecule possesses a total of 9 degrees of freedom: 3 translational and 6 associated with rotational and vibrational modes (3 rotational, 2 stretching, and 1 bending). This consistency in degrees of freedom applies regardless of the phase, including bulk ice, where these modes still exist.

PREREQUISITES
  • Understanding of molecular degrees of freedom
  • Basic knowledge of water's molecular structure
  • Familiarity with phase transitions (solid, liquid, gas)
  • Concepts of translational, rotational, and vibrational motion
NEXT STEPS
  • Research molecular dynamics simulations to observe degrees of freedom in different phases
  • Explore the implications of degrees of freedom on thermodynamic properties
  • Learn about vibrational spectroscopy techniques for analyzing molecular motion
  • Investigate the role of degrees of freedom in chemical reactions and kinetics
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Students and professionals in chemistry, physics, and materials science, particularly those interested in molecular behavior during phase changes and thermodynamic properties.

Geronimo85
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For a molecule of water, I understand that there are 6 degrees of freedom for each of the three atoms within it; 3 translational and 3 due to the potential energy of the bonds. Is this at all affected when the water goes from solid to liquid or gas?
 
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Geronimo85 said:
For a molecule of water, I understand that there are 6 degrees of freedom for each of the three atoms within it; 3 translational and 3 due to the potential energy of the bonds. Is this at all affected when the water goes from solid to liquid or gas?

Do you think that when something that can move freely in 3D is suddenly confined to a fixed location would have the same degree of freedom?

Zz.
 
Geronimo85 said:
For a molecule of water, I understand that there are 6 degrees of freedom for each of the three atoms within it; 3 translational and 3 due to the potential energy of the bonds. Is this at all affected when the water goes from solid to liquid or gas?

Nope, the number of degrees of freedom is exactly identical. 3 (xyz) per atom, giving 9 per molecule. The other way of looking at it is 3 rot + 3 Trans +1 bend +2 stretch =9 degrees of freedom per molecule.

Even in bulk ice you get those modes.
 

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