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\sect{Equilibrium of condensed Bosons and atoms B==2A}

$N$ Boson molecules of type B are inserted into a box with volume $V$.
The system temperature is $T$. 
Each molecule is composed from two atoms of type $A$. 
The mass of each atom is $m$, and the binding energy 
of the molecules is $\varepsilon$.

Assume that there are molecules in condensation, 
and that the atoms can be treated within the framework  
of the Boltzmann's approximation.

\begin{enumerate}

\item With regard to the atoms - what is the condition for the Boltzmann approximation.

\item How many free atoms occupy the the box?

\item How many molecules occupy excited states?

\item What is the minimal $N$ that is required to have condensation as assumed?

\item What is the pressure on the walls?

\item Who dominates the pressure - molecules or atoms?

\end{enumerate}
