1/2 L copper has the same outer diameter as 1/2 K or M copper. The same applies to pipe schedules. As a result, a slight increase in pressure losses is realized due to a decrease in flowpath as wall thickness is increased. In other words, 1 foot of 1/2 L copper has slightly less volume than 1 foot of 1/2 M copper.
Definition of omega. 1  1 : the 24th and last letter of the Greek alphabet â see alphabet table. 2  2 : the extreme or final part : end.
Alpha: They were forming the first sorority (back then it was technically a women's fraternity) in the school of music, and Alpha is the first letter of the Greek alphabet. Omega: They thought that their organization could also be the last of it's kind, so they chose to include Omega, the last letter in the Greek alphabet.