Learn the key differences between mass and weight , such as definition, formula, unit, quantity, and gravitational effect. See examples and test your knowledge with a quiz. Here is a simple explanation of the difference between mass and weight , with examples and a chart comparing the two concepts. The difference between Mass and Weight is Mass is a measure of Inertia and Weight is a measure of Force. Many often tend to use these two terms in the same manner. However, this is not correct at all. We will help you study the multiple differences that are between mass and weight . Thus, we will start by defining the respective terms to set a strong base. Only after knowing what they are can you understand their differences . So, let’s dive right in! Definition of Mass In simpler words, we ... Weight is a variable quantity that is affected by gravity while mass is a constant quantity. Mass is quantity denoting heaviness of an object while weight is force in presence of gravity. Thus, these two terms are inter-related. The absence of mass also results in no weight but the absence of weight in presence of mass is possible.