to convert 30mm into cm multiply the 30mm by 10. this is because there are 10mm to a cm.
30mm is 3cm (divide mm by 10)
They are both the same because 30mm - 3cm
30mm*230mm = 6900 millimetres = 271.653543 inches
The volume of a cylinder that is 30mm in diameter and 700mm high is 494,800.84mm3
Smaller 3cm = 30mm so 8mm is 22mm smaller than 30mm or 3cm