The phase of a substance at a temperature of 275 K or 1.85 degrees Celsius can be any of the three phases namely a solid, a liquid and a gas. This depends on the pressure where the substance is subjected. Also, the phase can be determined by a phase diagram where it shows the phase of a certain substance at a specific temperature and pressure.
That is the definition of pressure. The amount of force exerted over a certain area: N/m^2 (Newtons per square metre).
This means a release of free energy from the system corresponds to a negative change in free energy, but to a positive change for the surroundings.
