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From: tomyee3@gmail.com (ProkaryoticCaspaseHomolog)
Newsgroups: sci.physics.relativity
Subject: Re: Want to prove =?UTF-8?B?RT1tY8KyPyBVbml2ZXJzaXR5IGxhYnMgc2hvdWxkIHRy?=
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Date: Wed, 20 Nov 2024 15:57:23 +0000
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On Wed, 20 Nov 2024 14:46:05 +0000, rhertz wrote:

> As I wrote before, the cavity NEVER reaches a steady state (thermal
> equilibrium is just one possible goal to reach a steady state).
>
> The stored energy increases constantly until the temperature of the
> cavity
> walls (not cancelled by any means) destroy the material that form the
> cavity (either coatings or places on the cavity surface, making holes).

No, because the temperature of the foil rises until the power emitted
equals 5 watts. Once that happens, no further increase of stored
energy occurs.

P = ε * σ * T^4

Let us assume a 10x10x10 cm cube with surface area 0.06 m^3
So 5 watts total power emitted means 83 watts/m^2
Assume ε = 0.13

Let T_i be 273 K

83 = ε * σ * (T_f^4 - T_i^4)
11,260,344,593 = (T_f^4 - 5,554,571,841)
T_f = 274.8 K

In other words, the temperature of the foil rises to 1.8 degrees
above room temperature.

> In physics, a steady state is a condition in which a system or process
> does not change over time, or any changes are balanced out. This means
> that the variables that define the system's behavior remain constant.
> Some examples of steady states include:
>
> Bathtub with a running tap: After a while, the water level stabilizes
> and the system is in a steady state.
>
> Thermal equilibrium: Two systems are in thermal equilibrium when they
> are at the same temperature and there is no heat flow between them.
>
> In 72 hours none of these conditions are reached: No steady state nor
> thermal equilibrium. The inner temperature increase constantly, due to
> the accumulation of energy within the cavity.
>
> Regarding the orifice used to inject the laser beam, I always thought of
> using a directional micro-glass window that reflects, internally, laser
> hits.