An experiment that can be done at home to show that masses are not additive would be to take different size rubber duckies, fill up the bathtub and put the duckies in the tub. A small rubber duckie is going to float just the same as a larger rubber duckie, because the densities of the ducks will be the same. An example of an experiment that would show that volumes are not additive would be making jello. When making jello you use water and the jello mix, they each have their own density and mass. When you combine the two their masses and densities are combined, changing the whole product. The first experiment shows that masses are additive, because the putting the duckies in the tub is not changing the chemical property of the water of the ducks.
