What is the triple point pressure for Gallium?
At the very least your pressure has to be consistent with a whole number of molecules or atoms in your vapor phase.  Suppose you have a pressure of $7×10^{-34}$ atmosphere or (roughly) $7×10^{-29}$ Pa at $300$ Kelvins.  The average volume per atom/molecule is computed by the molecular level version of the Ideal Gas Law, in which the gas constant $R$ per mole is replaced by Boltzmann's constant $k=1.38×20^{-23}$ J/K per unit entity.  Thus

$V=kT/P=(1.38×10^{-23})×300/(7×10^{-29})=6.9×10^7$

cubic meters per vaporized entity.

So unless you are equilibrating your gallium over that much vapor volume, with high probability you do not have in practice even one atom or molecule of vaporized gallium.  In realistic laboratory or even industrual settings the triple point content of gallium vapor is most probably zero.