Mass is a measure of the amount of matter in an object, typically expressed in units like grams or kilograms. It indicates how heavy an object is and does not change regardless of its location. For example, a rock weighs the same on Earth as it does on the Moon, even though the gravitational pull differs. Volume refers to the amount of space an object occupies, measured in units such as liters or cubic centimeters. It can be determined using various methods, like measuring dimensions for regular shapes or using water displacement for irregular objects. For instance, a box has a specific volume based on its length, width, and height.