Which engineering field is considered the most challenging?

Electrical engineering is often regarded as the most challenging field in engineering due to its focus on abstract concepts and complex mathematical classes. Unlike other engineering disciplines, electrical engineers cannot physically observe the effects of their designs, making the study and design of electrical currents and circuits more challenging. Additionally, a strong grasp of abstract mathematical concepts such as partial differential equations is essential in this field. Other demanding engineering fields include chemical engineering, aerospace engineering, and nuclear engineering.