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Why the Polar Vortex Is Bad for Balloon Artists
Leave a balloon out in the cold and it’ll shrink and look pathetic. Sorry, but that’s the law—the ideal gas law.
It says the pressure ( P) times the volume ( V) equals the product of the amount of gas ( n), a constant of proportionality ( R), and the temperature ( T). First, it's important to note that the rubber skin of a balloon basically (but not perfectly) maintains a constant internal pressure. When we take it outside the gas gets cold, so the particles will have a lower average kinetic energy and move slower.
Or read this on Wired