Nyssa has been tasked with testing an Intex 42" Beachball for its ability to withstand overinflation. She begins by blowing it by mouth to full size. There is no benefit to measuring pressure during this phase, since vinyl inflatables have essentially no back-pressure until fully inflated. Once full inflation is achieved, she attaches the tube which allows her to continue blowing, with a check valve to prevent air from escaping (since there is nothing else to pinch shut between breaths), and also measure and record the pressure in the beach ball at a rate of 200 samples per second. A foot p...

Nyssa has been tasked with testing an Intex 42" Beachball for its ability to withstand overinflation. She begins by blowing it by mouth to full size. There is no benefit to measuring pressure during this phase, since vinyl inflatables have essentially no back-pressure until fully inflated. Once full inflation is achieved, she attaches the tube which allows her to continue blowing, with a check valve to prevent air from escaping (since there is nothing else to pinch shut between breaths), and also measure and record the pressure in the beach ball at a rate of 200 samples per second. A foot pump and relief valve are also available, but are not used. Nyssa bravely blows her hardest in spite of her fear of the tight vessel, which expands to a surprising amount. At one point she hears what may be a leak, and soon feels the air rushing against her bare foot, which she proceeds to use to plug the hole along one of the panel seams. She continues to puff mightily, until the hole expands beyond her ability to keep it closed.