Because it helps the balloons float instead of gravity pulling it down.It is a light gas that has small molecules
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Two of the naturally occurring isotopes of the element helium.
The amount of helium in a tank depends on how big the tank is (volume), the pressure of the helium and its temperature. It is calculated from the ideal gas equation with allowance for compressibility.
The element was first discovered from the spectrum of the sun so it was named after the Sun Helios.
Helium Digital Wristband HDBT-990 Model Review
