Why does iPhone 15 Pro have a thin and light design?

This year’s iPhone 15 Pro weighs 187 grams, which is 9% lighter than the iPhone 14 Pro’s 206 grams. Media reporters who have experienced the iPhone 15 Pro have also noticed that the phone has become lighter in their hands.

At the press conference, Apple emphasized the lightness of the new machine This was achieved due to the switch from stainless steel to titanium, but calculations by Dr. Drang’s LeanCrew blog concluded that the iPhone 15 Pro is lighter than the iPhone 14 Pro, not just because of the switch from stainless steel to titanium. The weight is reduced also because the moment of inertia of the phone changes.

Rotational inertia is a basic concept in physics. It measures the ability of an object to resist rotational motion. Its value is determined by the mass and mass distribution of the object. The farther the mass is from the object's axis of rotation, the greater the moment of inertia. For commonly used items like smartphones, the amount of rotational inertia plays an important role in whether they feel heavy or light in daily use.

A large part of the weight reduction of the new phone is concentrated on its outer frame, iPhone 15 The material switch from stainless steel to titanium on the Pro's bezel plays a key role in this change. By primarily reducing the mass of the outer bezel, Apple has achieved a more significant reduction in the phone's moment of inertia than simply reducing weight. This will make the iPhone 15 Pro easier to rotate, making it lighter than the 14 Pro.

Based on the analysis of the size of the new phone and assuming that the mass reduction is mainly in the frame of the phone, the moment of inertia of the iPhone 15 Pro is estimated to be reduced by 14–15%, which means that the iPhone Not only is the 15 Pro lighter, the way its mass is distributed also gives it a lower moment of inertia, which makes the phone feel lighter.

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