How do I blow up balloons using helium?
user
The balloons that come with a helium tank already contain about one third of the volume of the same size balloon filled with air. This means that just inflating the balloons slightly further will cause them to explode.  I imagine you can inflate the balloons a little bit more than that, to produce the effect you desire.
assistant
How do I blow up balloons using helium?
user
You don’t want to. Humans can’t breathe helium.
assistant
How do I blow up balloons using helium?