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Message: <blockquote data-quote="imhotep" data-source="post: 29208648" data-attributes="member: 562115">Take a look at the video below. Air from the smaller balloon goes into the larger one, increasing its size. This is because the pressure is higher in the smaller balloon.[MEDIA=youtube]1ftn09RBv74[/MEDIA]Assuming the balloon is spherical (usually it is) the relationship  between the Pressure & the Radius is governed by the equation...<a href="https://imgbox.com/lYsfwnhK" target="_blank"><img src="https://thumbs2.imgbox.com/76/c7/lYsfwnhK_t.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>whereP = internal pressure n/m^2P0 = initial pressureC = constant unique to the baloonr0 = initial radius (m)r = current radius (m)This is the equation which causes the graph (pressure sensor) on the video. The pressue reaches a peak, then lowers and becomes near steady. The equation is only accurate to radii of nearly 2.5r0.Also you might have noticed when blowing up a balloon - when you first start to blow, it can be extremely hard to inflate. This is because you have a small radius and the pressure increases rapidly.The internal pressure reaches it's peak at 1.38r0. Theoretically drop to zero (or P0) as r ---> ∞PS: [USER=578727]@mirissanew[/USER]  -  Note</blockquote>

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