Cylinders should be filled using?

Cylinders should be filled using the weight or volumetric method because these techniques ensure that the correct amount of material is accurately added to the cylinder. The weight method involves weighing the cylinder before and after filling to determine how much substance has been added, while the volumetric method calculates the volume being dispensed, ensuring that it matches the required specifications. This accuracy is crucial for safety and efficiency, particularly in industries that require precise measurements for chemical reactions, simulations, or energy production.

Using these methods helps prevent overfilling, which can lead to dangerous pressure buildup, leaks, or spills. The pressure method, visual inspection, and time-based filling methods, while they have their applications, do not offer the same level of precision necessary for safely filling cylinders. Thus, focusing on the weight or volumetric method is essential for maintaining safety standards and ensuring that filling processes adhere to regulatory guidelines.