A chemical property is a characteristic of a pure substance that describes its ability to change into different substances. For example, a chemical property of methane is that it can catch fire and burn in air. Physical properties can be observed or measured without changing the composition of matter.
The downsides are obvious: Almost everyone has headphones, speakers, and other gadgets based on the ubiquitous 3.5 mm headphone jack. Eliminating this connection could render these devices unusable, or at least force everyone to carry around an extra adapter. But Apple doesnât care.
Today, the Apple-made EarPods that come nestled in the box of every new iPhone use a regular old 3.5mm headphone jack. That means you can use them with any other device with a 3.5mm audio port. It also means you can use virtually any other pair of non-apple headphones with your iPhone.