Size and shape: 21"
Package item code: 14328P
Price includes inflation with helium.
Float times for foil balloons.
In an ideal environment, mylar (foil) balloons will remain full and taut for 3-5 days. They will continue to float for two weeks or longer. Air-conditioned air may cause these balloons to shrivel, but they will return to a normal state when exposed to warmer air.
On hot days, in direct sunlight, balloons may pop within an hour. The same result can occur indoors if balloons are exposed to direct sunlight through windows.
Very cool environments may cause helium molecules to shrink, reducing the size and float time of balloons.
Indoors or outdoors, the constant flow of air around a balloon will increase the speed at which helium molecules escape through the wall of the balloon, resulting in reduced float time.