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.
MacBook Airs all arrive with 4GB of RAM, which can be upgraded on the Apple Store to 8GB for Â£80, while the 13. MacBook Pros with Retina displays all start with 8GB, upgradeable to 16GB for Â£160, and the 15 models all come with the maximum 16GB already fitted. The one exception is the old-style 13 MacBook Pro.