# Tag Info

1 vote

### How much information is encoded in a ball on a field?

Just a rough estimate. Let's take a standard soccer field dimensions $100~\text{yard} \times 50~\text{yard}$. Assuming a ball can be placed anywhere within this field with a $\delta x = 1~mm$ ...
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### How much information is encoded in a ball on a field?

If I understand correctly, this question reduces to "how much information can be stored in a point in a plane?" My answer would be: the amount of information that can be stored in a point at ...
• 1,561
1 vote

### At what size of matter does the second law of thermodynamics breakdown?

(Not an expert) In a statistical experiment the noise (i.e., the random fluctuations) is also known as Poisson noise, and it can be shown to be proportional to $1/ \sqrt{N}$, where $N$ is the number ...
• 21.3k
1 vote

• 19.6k

### Use of Clausius theorem to prove entropy inequality in Fermi's Thermodynamics

Start by the definition of entropy. By definition: $$S(B)-S(A) = \int_{Rev,\,A\to B}\frac{\delta Q}{T_e}$$ for any reversible path from $A\to B$. The definition is well posed since Clausius' ...
• 12.8k
1 vote

### What causes the latent heat of solidification?

The crystal arrangement is the lowest energy arrangement at that temperature. During the phase transition, think about one atom that is not part of the crystal yet. When it finds its spot in the ...
Accepted

### What causes the latent heat of solidification?

Think of the atoms in a solidifying liquid as being like magnets snapping together. Magnets starting even at rest (with no kinetic energy) can, as they come together, develop quite a bit of speed. The ...
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### What causes the latent heat of solidification?

Maybe the thing seems weird to your physical intuition because you are muddling cause and effect. It's not that configuring the atoms causes heat to be produced, it's that if heat is removed then the ...
• 59.5k
1 vote
Accepted

### What does life (photosynthesis) change for entropy? A thought experiment

Let me first point out that the entropy production in non-equilibrium open systems has been studied - it is not fully understood, but some things are known - see, e.g., the discussion in thread ...
• 59.4k
1 vote

### What does life (photosynthesis) change for entropy? A thought experiment

Let's first consider some basics. Does a mirror produce entropy when light shines on it? No, the entropy of the light bounces off of the mirror, or reflects. Does a broken mirror, that looks white, ...
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### What is the relationship between Clausius Inequality and 2nd Law?

The Clausius inequality applies to a closed system, and does not include the surroundings. The more correct form of this inequality is $$\Delta S_{syst}\geq \int{\frac{dQ}{T_B}}$$where $T_B$ is the ...
• 33.9k

### Entropy and gravity

I found a good example to clarify the gravity-entropy issues. We on earth get radiation from the sun(mostly light)- use the blue part in photo-synthesis and do all sorts of work with the products, ...
• 506

### Is an interaction-free measurement an irreversible process?

Realistically, a piece of lab equipment sitting idle undergoes irreversible changes from blackbody radiation, radionuclide decay, outgassing of surface atoms, etc. That probably goes double if it's ...
• 27.4k