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This is a summarising investigation of the events of the phase transition ofthe first order that occur in the critical region below the liquid-gas criticalpoint. The grand partition function has been completely integrated in thephase-space of the collective variables. The basic density measure is thequartic one. It has the form of the exponent function with the first, second,third and fourth degree of the collective variables. The problem has beenreduced to the Ising model in an external field, the role of which is played bythe generalised chemical potential $\mu^*$. The line $\mu^*(\eta) =0$, where$\eta$ is the density, is the line of the phase transition. We consider theisothermal compression of the gas till the point where the phase transition onthe line $\mu^*(\eta) =0$ is reached. When the path of the pressing reaches theline $\mu^* =0$ in the gas medium, a droplet of liquid springs up. The work forits formation is obtained, the surface-tension energy is calculated. On theline $\mu^* =0$ we have a two-phase system: the gas and the liquid (thedroplet) one. The equality of the gas and of the liquid chemical potentials isproved. The process of pressing is going on. But the pressure inside the systemhas stopped, two fixed densities have arisen: one for the gas-phase $\eta_{g} =\eta_{c} ( 1 - {d}/{2})$ and the other for the liquid-phase $\eta_{l} =\eta_{c} (1 + {d}/{2} )$ (symmetrically to the rectlinear diameter), where$\eta_{c} = 0.13044$ is the critical density. Starting from that moment theexternal pressure works as a latent work of pressure. Its value is obtained. Asa result, the gas-phase disappears and the whole system turns into liquid. Thejump of the density is equal to $\eta_{c} d$, where $d = \sqrt{{D}/{2G}} \sim\tau^{\nu/2}$. $D$ and $G$ are coefficients of the Hamiltonian in the last cellconnected with the renormalisation-group symmetry.

The phase transition of the first order in the critical region of the gas-liquid system