Method of determining a solution state of a gas

A non-transitory computer-readable storage medium storing a program for determining a solution state of a gas in a plastic melt used in a plastic shaping method comprising commands which cause a computer when executing the program to carry out the following steps:

• outputting at least one first actuation signal to a shaping machine for providing the plastic melt together with the gas in a chamber,
• outputting at least one second actuation signal to the shaping machine for altering a volume of the chamber, whereby a pressure of the plastic melt together with the gas is altered from a first pressure value to a second pressure value,
• outputting at least one third actuation signal to the shaping machine for introducing the plastic melt into a shaping cavity,
• computing at least one compression parameter characteristic of the compression behaviour of the plastic melt from the first pressure value and the second pressure value, and
• determining from the at least one compression parameter whether the gas is substantially completely dissolved in the plastic melt and/or determining a solubility limit of the gas in the plastic melt from the at least one compression parameter.