[Lex Computer & Tech Group/LCTG] why does ice float

[Peter Shaw]

Yes, a nice reminder of some basics of life in the world. Some have posited
that life would be very different if ice didn't float -- ice-9, one
fictional variant.

Regarding the abstract, "The presence of a maximum in density is one of the
well-known anomalies of water"

What are some of the other anomalies?

On Tue, Sep 17, 2024 at 3:13 PM Ted Kochanski via LCTG <lctg at lists.toku.us>
wrote:

> All,
>
> Not to get too far into QM --- But it's not Chemistry -- it's Physics - -
> and then why is the minimum in a V(T) for water found @ 4C [actually 277.13
> K] @ atmospheric pressure?
> as is the corollary how can we skate on ice
>
> see for example:
> Fluid Phase Equilibria Volume 560, September 2022, 113515
>
> Simulation and theoretical analysis of the origin of the temperature of
> maximum density of water
> D. González-Salgado, E.G. Noya, E. Lomba
> Received 11 January 2022, Revised 20 May 2022, Accepted 23 May 2022,
> Available online 25 May 2022, Version of Record 1 June 2022.
>
> Abstract
>
> The presence of a maximum in density is one of the well-known anomalies of
> water. This maximum is located at 4°C at room pressure and it moves to
> lower temperatures as pressure increases. In this work, we attempt to
> provide a quantitative explanation of the existence of the temperature of
> maximum density, *T*MD, and its dependence on pressure, using a
> description in terms of low and high density water states. To that aim, we
> analyzed *NpT* molecular dynamics
> <https://www.sciencedirect.com/topics/physics-and-astronomy/molecular-dynamics> trajectories
> of TIP4P/2005 liquid water from -1800 bar to 1000 bar, and from 238.15 K to
> 328.15 K. We computed the mole fractions of the low and high density water
> states and their partial molar volumes. We found that the temperature
> dependence of both quantities plays a fundamental role in the existence of
> the *T*MD. On the other hand, only the variation with pressure of the
> mole fractions of the low and high density water is essential to explain
> the *T*MD pressure dependence. Additionally, we have also performed an
> equivalent analysis using the parameterization of the two-state
> thermodynamic model proposed by Biddle *et al.* [J. Chem. Phys. 146,
> 034502 (2017)] obtaining similar conclusions.
>
>
> https://doi.org/10.1016/j.fluid.2022.113515
>
> Ted
>
> On Mon, Sep 16, 2024 at 5:01 PM John P. Rudy via LCTG <lctg at lists.toku.us>
> wrote:
>
>> It is just to be funny as Calvin and Hobbes always it
>>
>>
>>
>> *From:* Robert Primak <bobprimak at yahoo.com>
>> *Sent:* Monday, September 16, 2024 3:09 PM
>> *To:* Lex Computer Group <lctg at lists.toku.us>; John P. Rudy <
>> jjrudy1 at comcast.net>
>> *Subject:* Re: [Lex Computer & Tech Group/LCTG] why does ice float
>>
>>
>>
>> As a  degreed chemist, I don't need to look this one up.
>>
>>
>>
>> But the Dad Answer looks a lot like ChatGPT made it up.
>>
>>
>>
>> -- Bob Primak
>>
>>
>>
>>
>>
>>
>>
>> On Monday, September 16, 2024 at 12:16:11 PM EDT, John P. Rudy via LCTG <
>> lctg at lists.toku.us> wrote:
>>
>>
>>
>>
>>
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