Volume would be measure in one of the linear scales (mm, cm, m, km) CUBED. For example, if a box is 10cm x 10cm x 5cm in size, its volume is 10 x 10 x 5 = 500 cm3 (centimeters cubed). You can do this for meters (meters cubed), etc.
meteric system
wind gage
meters or kilometers
ml is a metric measure
Time
Latitude lines
241cm 24.1cm
If you're American, it's the meter. Anywhere else, the metre.
dd639a167834ec65099454b5a105 in system volume information
Basically the system volume is required to start up, and the boot volume contains the OS. From http://support.microsoft.com/kb/314470: The system volume refers to the disk volume that contains the hardware-specific files that are needed to start Windows, such as Ntldr, Boot.ini, and Ntdetect.com. On computers that are running the Intel x86 line of CPU processors and later versions, the system volume must be a primary volume that is marked as active. This requirement can be fulfilled on any drive on the computer that the system BIOS searches when the operating system starts. The system volume can be the same volume as the boot volume. However, this configuration is not required. The boot volume refers to the disk volume that contains the Windows operating system files and the supporting files. By default, the Windows operating system files are in the WINDOWS folder, and the supporting files are in the WINDOWS\System32 folder. The boot volume can be the same volume as the system volume. However, this configuration is not required. There is only one system volume. However, there is one boot volume for each operating system in a multiboot system."
If, by 'metric system', you mean the 'SI system', then there is no base unit for volume. The unit for volume is called a 'derived unit', and it is the cubic metre (m3).
The base unit of volume in the metric system is the liter (L).