Apple MACBOOK - Manual (Page 106)

106 Appendix B Safety, Use, and Care Information
Using Your MacBook
When you’re using your MacBook or charging the battery, it is normal for the bottom of
the case to get warm. For prolonged use, place your MacBook on a flat, stable surface.
Do not leave the bottom of your MacBook in contact with your lap or any surface of
your body for extended periods. Prolonged contact with your body could cause
discomfort and potentially a burn.
The bottom of the MacBook case functions as a cooling surface that transfers heat
from inside the computer to the cooler air outside. The bottom of the case is raised
slightly to allow airflow that keeps the unit within normal operating temperatures.
In addition, warm air is vented from the slots in the back of the case.
Carrying Your MacBook
If you carry your MacBook in a bag or briefcase, make sure that there are no loose
items (such as paper clips or coins) that could accidentally get inside the computer
through an opening such as the optical drive slot or get stuck inside a port. Also, keep
magnetically sensitive items away from the power adapter port.
Warning: Do not place your MacBook on a pillow or other soft material when it is on,
as the material can block the airflow vents, in particular the rear vents, and cause the
computer to overheat. Never place anything over your keyboard when operating in
closed-lid mode. This can cause your computer to cycle on and off which might create
excessive heat and drain your battery. Never turn on your computer unless all of its
internal and external parts are in place. Operating the computer when it is open or
missing parts can be dangerous and can damage your computer.