Mass Vs Weight
This force scales shows the upward force exerted upon a 1.0-kg mass in order to balance it. This upward force is equal to the downward force of gravity of the 1.0-kg mass. This downward force is known as the weight and has a value of 9.8 N for this 1.0-kg mass.
For more information about the relationship between mass and weight, visit The Physics Classroom Tutorial - www.physicsclassroom.com/Class/newtlaws/index.cfm.