a balmer line is the ghostly remnants of a poltergeist. They float around your house and murder your pet kitten.
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Helium accounts for around 8% of the volume of all matter (baryonic particles) in the universe.
to lift 1 kg or 2 pounds you need 0.16 kg of helium so for 2000 pounds you need 160 kg of helium or 320 pounds at 1 atmosphere
Helium
Thirty gallons of anything is thirty gallons. Maybe you're asking about compressing helium, but you need to say what pressure you're using and what temperature, to determine how much helium will fit into a 30 gallon tank.
he tried to helium