Examination of the units used to express mass and volume. The definition of weight as the force of gravity on mass is given.The force of gravity listed as 10 Newtons/sec squared. How a scale works by causing springs to move based on the weight of the object was given. The unit of weight is the Newton. The definition of mass presented as the amount of matter. The units of measurement being the kilogram, gram, and milligram. The definition of volume as the amount of space occupied by a given amount of mass was shown, with the unit being the cubic meter, and cubic centimeter. Examples of each were demonstrated, with the mas of some common objects given in grams and the volumes of common substances calculated.