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I want a balloon to "pop" at the touch of a sharp knife. Storing a ballon to optimum stretch inside a cake? Answered

I made 1 excellent exploding cake with a balloon. I haven't been able to replicate the event as successfully. I need the balloon to be maximally inflated, to the point it will go "pop"! when the merest touch of a sharp blade touches it. Also if the balloon is concealed inside a whip cream, cake combo, does hot or cold temperature affect the expansion of the balloon? Is there anyone out there who has experience, or can solve this dilemma for me?

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qwertyman10
qwertyman10

11 years ago

If you inflate it to maximum then hit it VERY lightly with a blowtorch, then blow it up more so its thinner. Or: Baked Alaska! :P

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canida
canida

11 years ago

My guess is that you've been buying thicker balloons. The temperature change is likely to produce minimal effects unless you're using an ice cream cake or very cold whipped cream, so the primary variable is simply the type of balloon you purchase. Grab a few different types at the store, and pre-test!

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kelseymh
kelseymh

11 years ago

PV ~ T, so if the pressure is constant, the volume is proportional to the absolute (kelvin) temperature. Use as small a balloon as you can find, so that the material is maximally stretched (and the pressure is highest).

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Kiteman
Kiteman

Answer 11 years ago

Translation: cold stuff makes the balloon less likely to pop so easily.

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kelseymh
kelseymh

Answer 11 years ago

The translation ought to be "cold stuff makes the balloon smaller," in response to Guest's embedded question, "does hot or cold temperature affect the expansion of the balloon." However, you are quite correct that a cold balloon will be less likely to pop, since the volume will be smaller and consequently the rubber less stretched.

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Kiteman
Kiteman

Answer 11 years ago

Haha, your clarification is a third longer than the original statement I simplified!