Physical properties are often characterized as intensive and extensive properties. An intensive property does not depend on the size or extent of the system, nor on the amount of matter in the object, while an extensive property shows an additive relationship.
Just as Apple regularly updates its iOS mobile operating system, the company also periodically updates its OS X operating system for its MacBook Pro computers. If you own a MacBook Pro, regularly updating your Apple laptop with the newest operating system is a great way to ensure that your device always has the latest apps, features, and security enhancements.
This is usually done when you need to install a fresh copy of the Mac OS on a fresh hard drive, or, if your computer is not working, it can be used to reinstall your operating system. Step 1. Insert the bootable CD into the CD drive of your MacBook Pro while it is on. Step 2. Turn your MacBook Pro off.