Is Quantum Mechanics Necessary for Understanding Water's Properties?

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Discussion Overview

The discussion centers on the role of quantum mechanics in explaining the properties of water, including its molecular behavior and specific phenomena such as the triple point and the boiling point. Participants explore both quantum and classical perspectives on this topic.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants assert that quantum mechanics is essential for explaining the properties of atoms and molecules that contribute to water's characteristics.
  • One participant specifically inquires about a quantum mechanical explanation for the triple point of water, suggesting a need for more focused questions in the discussion.
  • Another participant expresses interest in understanding why water remains liquid at room temperature, mentioning molecular polarization and questioning the necessity of quantum mechanics for such explanations.
  • Hydrogen bonding is highlighted as a crucial factor in understanding water's collective behavior, with a mention of quantum tunneling between water molecules.
  • Despite the quantum mechanical aspects, some participants note the existence of classical models that effectively reproduce many properties of water, indicating a potential alternative approach.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of quantum mechanics for understanding water's properties, with some emphasizing its importance while others point to the effectiveness of classical models. The discussion remains unresolved regarding the extent to which quantum mechanics is required.

Contextual Notes

Participants have not fully explored the assumptions underlying their claims, such as the definitions of "properties of water" or the specific contexts in which quantum mechanics may or may not be necessary. There are also unresolved questions about the calculations related to boiling points and the types of physics involved.

Andrew Wright
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To what extent is quantum mechanics needed to explain the properties of water?

Thanks in advance.
 
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Andrew Wright said:
To what extent is quantum mechanics needed to explain the properties of water?

Quantum mechanics is needed to explain all of the properties of atoms and molecules that underlie the properties of water.
 
"Does anybody know of a direct quantum mechanical explanation for the existence of the triple point of water? Please, point me to a paper or book." This is a spot-on question to ask in an open forum. The one in the OP is much too general.
 
dextercioby said:
"Does anybody know of a direct quantum mechanical explanation for the existence of the triple point of water? Please, point me to a paper or book." This is a spot-on question to ask in an open forum. The one in the OP is much too general.

Yes, I am specifically interested in the quantum mechanics behind why water is liquid at room temperature. I am told this is an unusual property caused by polarisation within the molecules, but do you need quantum mechanics? Is there a calculation, for the boiling point and what type of physics does it use?
 
Hydrogen bonding is very important for understanding the collective behavior of water molecules, including the possibility for hydrogen atoms to tunnel from one water molecule to another. In that sense, the properties of water are very quantum mechanical.

That said, there exists pretty good classical models of water, used in molecular dynamics, that reproduce pretty well many aspects of water.
 

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