The ambient temperature should be set to the average ambient temperature at the site where the injection molding occurs.
The default value for ambient temperature is 25°C (77°F).
You can change this value to match the ambient temperature at your site. The new value will be used throughout the analysis sequence.
The program uses the ambient temperature value to calculate a nominal stroke volume by multiplying the cavity volume by the ratio of the material density at the ambient temperature to the density at melt temperature.