MASS IS A SCALAR
 

The mass of an object or particle has magnitude (size or extent) but not direction. It can be represented as a certain number of kilograms, such as Copyright 2002 by The McGraw-Hill Companies, Inc. Click here for Terms of Use. the mass of the Sun or the mass of the Earth. Mass is customarily denoted by the lowercase italicized letter m. You might think that mass can have direction. When you stand somewhere, your body presses downward on the floor, the pavement, or the ground. If someone is more massive than you, his or her body presses downward too, but harder. If you get in a car and accelerate, your body presses backward in the seat as well as downward toward the center of the Earth. But this is force, not mass. The force you feel is caused in part by your mass and in part by gravity or acceleration. Mass itself has no direction. If you go into outer space and become weightless, you will have the same mass as you do on Earth (assuming that you do not lose or gain mass in between times). There won’t be any force in any direction unless the space vessel begins to accelerate.