From the q8 model: "A kilogram is a fixed unit of mass, so regardless of the object, if it weighs 1 kg, it has the same weight. In this case, both a kilogram of

From the q8 model: "A kilogram is a fixed unit of mass, so regardless of the object, if it weighs 1 kg, it has the same weight. In this case, both a kilogram of feathers and another kilogram of feathers would have the exact same weight, just as two different objects with the same mass will also have equal weights."