Final answer:
A fillable refrigerant cylinder must never be filled to more than 80% of its capacity by weight to allow for thermal expansion and prevent overpressure incidents.
Step-by-step explanation:
A fillable refrigerant cylinder must never be filled to more than 80% of its capacity by weight. This is to allow for expansion of the refrigerant if it warms up, preventing possible overpressure issues and potential cylinder failure. Overfilling the cylinder can be hazardous, as the refrigerant liquid needs space to expand when the temperature increases. Exceeding the cylinder's rated fill capacity can lead to dangerous conditions, including cylinder rupture, valve failure, or explosive release of the contents.
Proper safety protocols, such as using scales to accurately measure the refrigerant during filling and respecting the maximum fill limit, are critical when handling pressurized cylinders. In the context of the provided references, understanding the pressure, volume, and temperature relationships in gases—summarized in the ideal gas law—helps provide context about the importance of not overfilling gas cylinders, although those specific examples don't address refrigerant cylinders directly.