Repeat this activity but this time measure the circumference of the balloon each time and estimate the volume of air inside the balloon by calculating the volume of a sphere. However, you could more accurately measure the different balloon sizes and see how this correlates to the time the hovercraft hovers for. In this activity, you approximately made the balloon different sizes.There may have been some variation (of just a few seconds) between the three trials because it is nearly impossible to fill the balloon with exactly the same amount of air each time. Likewise, when the balloon was inflated to its smallest size, it held the least amount of air and so the hovercraft should have hovered for the least amount of time, and when the balloon was inflated to a medium size, it should hovered for an in-between amount of time. ![]() When the balloon was inflated to the largest size, it held the greatest amount of air and should have allowed the hovercraft to hover for the longest amount of time. This means that while you tested balloons that were inflated to different sizes, because the pop-top lid stayed the same, the opening that allowed air to go beneath the hovercraft was always the same size. The air coming from the balloon traveled through the pop-top lid to go under the hovercraft. While modern hovercrafts often use propellers on top of the hovercraft to push air beneath the hovercraft, in this activity you used a balloon to do this instead of propellers. ![]() Overall, which size balloon allowed the hovercraft to hover for the longest amount of time? Which allowed it to hover for the shortest amount of time? Why do you think this happened?
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