Helium

They say soon we will run out of helium.
Most people think, “What’s the big dealium?
So our voices won’t squeak
When we inhale a leak –
Balloons will just lose some appealium.”

But balloons aren’t the sole use of helium:
For industrial stuff, it’s idealium.
When released without thought,
It can never be caught,
But escapes from the earth with great zealium.