The time limit for. shipping a POV is the same as for travel and HHG transportation limits (JTR Para 5366, POV. Transportation Time Limitation), 1 year from the date of retirement/separation with severance. pay or 180 days from the date of separation.
The envelope is the large bag that holds the helium gas. The envelope is generally cigar-shaped, for aerodynamic purposes, and made of a durable, airtight, lightweight fabric (polyester composites) that is much like the fabric of a space suit.
The element helium is an inert or noble gas, and is found on the periodic table with the other inert gases in Group 18. They're the elements down the far right column of the table. Helium, which is the second most abundant element in the universe (behind hydrogen) is about a quarter of all matter.It is a gas here on earth, and can only be liquefied if it is cooled to near absolute zero. It will not solidify, by the way. Outside earth, it is mostly found in stars where it is a plasma.elium is an element, featuring on the Periodic Table of the elements. Helium was first discovered in the sun spectroscopically. It get its name from the Greek word, Helios, meaning the sun.