The units for a number of other quantities can be derived from the SI base units. ... Since volume is length cubed, its SI derived unit is m3. Related units are the cubic centimeter (cm3) and the cubic decimeter (dm3). Another common unit of volume is the liter (L).
Yes, technically it is true that the Byzantine emperor, who believed that Muslims posed a threat to Christian Constantinople, requested help from Europe, although he mostly dealt with them himself.
