Blow a bubble. Subtract the mass of the gum. Your answer is the mass of one breath. Repeat the steps five times and calculate the average. Record your data.
Density is the mass of an object per unit volume.
Density is one of the physical properties of matter that you experience on a daily basis. You may be surprised to find out that a Diet Pepsi will float and a regular Pepsi will sink when placed in water. This is due to the different densities of the two sodas. Unwrap the candy bars and measure the mass of the two bars. Record your values.