Balloons can be filled with air, by blowing into it
. Air pumps are currently used in order to inflate more balloons quickly. Balloons that float are more popular among children so helium is usually used. It is also used to fill up latex balloons but it only remains inside for some time because the helium atoms escape through the pores of the latex. In order to prevent the leakage, the interior of the balloons are treated with a polymer solution such as hi-float gels that make them less permeable. Other types such as foil and plastic balloons are a lot less porous and they can float for up to five weeks! In all, balloons provide a lot of fun and one can't imagine special occasions or parties without them.