What is the term for copper tubing that comes in rigid, straight lengths?

The term for copper tubing that comes in rigid, straight lengths is "Hard Copper." This type of copper is typically used in applications that require a strong, permanent installation, such as in plumbing and HVAC systems. Hard copper is more rigid compared to flexible or soft copper, allowing it to maintain its shape and resist deformation under pressure or stress.

In contrast, flexible copper is designed for applications that require bending or curving around obstacles. Soft copper tubing is malleable, making it easy to bend and shape, but it does not offer the same structural integrity as hard copper. Seamless copper refers to copper pipes that are manufactured without seams, but this term does not specifically relate to the rigidity or straightness of the tubing. The distinction of hard copper lies in its suitability for fixed installations, contributing to its selection for durability and reliability in various construction and repair tasks.