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a bunch fo phys

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Krishna
2024-11-17 17:35:10 -06:00
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content/physics/thermodynamics.md
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@@ -25,7 +25,7 @@ When it comes to energy transfer and phase changes there are only two useful equ
These equations together describe the heat energy required for changing the temperature of a substance and for changing its phase. These equations together describe the heat energy required for changing the temperature of a substance and for changing its phase.
**It is important to note the alternate arrangement of both: **It is important to note the alternate arrangement of both**:
$$ $$
Q=nc_{\mathrm{mol}}\Delta T = \Delta \textbf{KE} Q=nc_{\mathrm{mol}}\Delta T = \Delta \textbf{KE}
$$ $$
@@ -91,3 +91,16 @@ P_b=A\varepsilon \sigma\cdot T^4
$$ $$
Where $A$ is the area of the exposed surface. Where $A$ is the area of the exposed surface.
## Emissivity and Albedo
Emissivity $\varepsilon$ is given by :
$$
\varepsilon=\frac{P_{\text{obj}}}{P_b}
$$
Albedo is given by:
$$
\alpha=\frac{P_\text{reflected}{P_{\text{incoming}}}}
This is where the Boltzmann law comes in to play. In order to calculate the emissivity of an object, you first need bot: the power of emissions from the target object, and the Power that would be emitted by a black body of the same temperature. This value can be procured using the Stefan Boltzmann Law of Radiation.
Albedo, however, is a far simpler quantity, relying only on the input and output energies of the object.