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Expansion Buses are used to connect devices to the motherboard and therefore allow the flow of data between that device and other devices in the computer.
riser board
An expansion bus is made up of electronic pathways which move information between the code of a computer system, including the CPU and RAM, and peripheral devices. It is a collection of wires and protocols that allows for the expansion of a computer
Dictionary: expansion - noun The act or process of expanding In this case you are expanding the capability of your motherboard. Though you didn't mention what type of expansion slot. ISA, PCI, PCI-E or AGP? These ports allow you to add more graphics cards, extra communication ports, network ports, flash memory boards, extra sata/scsi/ide controllers.
Peripheral ports such as COM, USB and serial ports, are input/output interfaces that allow devices to connect to a computer. Expansion slots are sockets on the motherboard where an expansion card is inserted.
expansion slots
A webcam
On an ATX motherboard, the CPU will be placed above and parallel to the expansion slots, towards the top of the case. On an AT or Baby AT motherboard, the CPU will be placed in front of the expansion slots, towards the front of the case.
Computers include expansion slots that allow users to add new devices to their computers. A computer player, for example, may upgrade their video card to improve gaming performance. They can use an expansion slot to swap out the old video card with a new one without having to replace the motherboard. What are the advantages of having expansion slots? A computer's expansion slots can be used to install network cards. If the computer does not already have a Wi-Fi adaptor, a Wi-Fi network card can be installed. Furthermore, as newer, faster Wi-Fi standards are announced, expansion card Wi-Fi adapters can be swapped out for newer, faster cards.
Just install the Egrip and the expansion chamber. Is what you can't do, the egrip frame comes too close to the tombstone to allow for an expansion chamber to fit, I'm trying to find a solution, did anyone find one yet?
to allow for the thermal expansion or contraction
Nope you will need the burning crusade expansion installed before it will allow you to install WotLK.