Principle objective of this lecture is to present on Volume and Surface Area. Volume and surface area help us measure the size of 3D objects. Volume is the amount of space occupied by any 3-dimensional object. It means, the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great. For this example the volume is 4×5×10 = 200 units³. Units of volume include: Metric: cubic centimeters (cm³), cubic meters (m³), liters. US Standard: fluid ounce, cubic inch, cubic foot, pints, gallons.