CS>OXYGEN TANKS FOR NEBULISER

[Boone Nittayo]

Can anyone tell me if the o2 for welding use and medical use are the same ? 
Which one is good for o2 nebuliser ?  Which o2 tank is recommended  ? What is 
the minimum size of the tank that would be sufficient to operate air brush  
nebuliser ?
 
Thanks,
Boone