Which metal is the lightest and most commonly used in avionic systems?

The lightest and most commonly used metal in avionic systems is aluminum. Aluminum is favored for its excellent strength-to-weight ratio, making it ideal for applications where weight is a critical factor, such as in aviation. Its lightweight nature helps improve fuel efficiency and overall performance of aircraft.

Aluminum is also highly resistant to corrosion, particularly when treated or coated, which is essential in avionic systems that may be exposed to various environmental factors. This corrosion resistance ensures the longevity and reliability of electronic components.

While magnesium is lighter than aluminum and offers some similar benefits, such as good strength and low density, it has limitations in terms of corrosion resistance and is not as frequently used in aviation applications. Other metals like copper and iron are generally heavier and not as suitable for weight-sensitive applications like those found in aviation.