Final answer:
Cylinders of liquified gases should not be charged to more than 80% of their maximum capacity by weight or pressure to ensure safety and prevent accidents.
Step-by-step explanation:
In the context of liquified gases, they should not be charged to more than 80% of their maximum capacity by weight or pressure.
This limitation is in place to ensure safety and prevent accidents.
For example, if a cylinder has a maximum capacity of 100 kg, it should not be charged with more than 80 kg of liquified gas.