What unit of measurement is commonly used to express weight in aviation?

In aviation, weight is typically expressed in either pounds or kilograms because these units are widely accepted and standardized for various international regulations and guidelines. Pounds (lbs) are predominantly used in the United States, while kilograms (kg) are more commonly adopted in many other parts of the world. This duality allows for clear communication of weight information across different systems and maintains consistency in operations, cargo calculations, and safety measures.

Other options do not capture the accepted standards; for instance, tons and liters are not specific to weight—liters measure volume, and while tons can be used, they're less common in everyday aircraft operations compared to pounds and kilograms. By utilizing both pounds and kilograms, aviation professionals ensure that they can accurately communicate and apply weight measurements in diverse contexts and locations.