Helium2goau
Just like hot air, helium is lighter than air at ambient temperature. This is the reason why helium balloons rise when they are let loose. This makes them ideal for party decorations as well as weather observatories for scientific studies. For parties, get helium balloons delivered through professionals.
https://helium2goau.wordpress.com/2018/10/23/why-is-helium-used-in-balloons/
