iPhone 15 Pro: Lighter Feel, Titanium Colors, and Anticipating the iPhone 16 Ultra

The iPhone 15 Pro not only weighs less than its predecessor due to a switch from stainless steel to titanium, but also feels even lighter than its actual weight reduction suggests. This is because of a change in the device's moment of inertia, which measures an object's resistance to rotational motion. By reducing mass predominantly at the phone's outer edges, Apple has achieved a significant reduction in moment of inertia, making the iPhone 15 Pro feel more agile and nimble, amplifying the impression of lightness.