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.
5 Ways USB Type-C Headphones Will Improve Our Lives. Phone connector, audio jack, TRS, mini, 1/4 inch or 1/8th inch jack. There are a lot of names for the port you use to plug in your headphones. There are many variations and different sizes, but the audio jack has been around in more or less the same form since 1878.