The density of the child's balloon will be affected in this manner:
Density is a concept that measures the amount of heaviness of a thing. It is gotten by diving the mass of the substance by the volume.
For the scenario described above, the resultant effect of the heat stemming from the dryer is that the helium particles will be made to move faster and cover a significant part of the balloon. But the volume of the ballon will remain the same since there is no incremental action.
Learn more about density here:
https://brainly.com/question/1354972
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