Celebrated on August 18th
At temperatures close to absolute zero helium condenses to a liquid with amazing properties – the properties of a superfluid, flowing with zero friction up and over the walls of containers. Helium is so light that Earth’s gravity is not strong enough to hold on to it. When helium atoms are released into the atmosphere, they rise until they escape into space.
Helium is the least dense and second lightest of all known elements. It is because of this, when a balloon is filled with Helium, it floats up.
It would take 2500 balloons, each filled with 10 liters of helium , to lift a 55 lb. child off the ground