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.
Audio combo jack vs headphone/earphone with mic and speaker connector. Question. I see the audio combo jack in my T510 (identified as number 6 in the image above), but I've used a regular headphone in it without plugging in the mic connector. How do I hook up a regular microphone - does the port know the difference between 2- or 3-conductor microphone plug and a stereo headphone plug?