She repeated the same thing with granulated sugar, which also became attached to the balloon, for the same reason. Sarah gave 35 cc syringes and balloons to each of us. From the fact that that balance tilted toward the inflated balloon, we concluded that the inflated balloon has more mass, because of the air inside. We pushed the plunger back into the syringe, and compressed the air inside quite easily. Those who were closer to the spray would smell it first, etc.
Gases exert pressure .
We squeezed an inflated balloon, and could feel the pressure exerted by it. Submerge the balloon in hot water, and then put it into an ice bath. You could actually see the balloon expanding and contracting. The half-life of a radioactive element is defined as the time required for half of the atoms in question to decay. For example, the unstable isotope Carbon 14 decays into the stable isotope Carbon 12 with a half-life of 5500 years .