<Li> The cumulative song "The Barley Mow". </Li> <Li> In The Doors song "The Crystal Ship", the line, "the crystal ship is being filled a thousand girls," some people report that "girls" should be "gills". </Li> <Ul> <Li> A gill is also referenced in "Archer" season 2, episode 3 ("Blood Test") when Barry explains to Archer that a liter is, "about 8 gills". (Eight gills would be 40 Imperial fluid ounces, or 1.13 Liters). </Li> <Li> In "Bart the Genius," an episode of "The Simpsons," a child tricks Bart by offering, "I'll trade you 1,000 picoliters of my milk for four gills of yours ." (A picoliter is a trillionth of a liter, so Bart is losing almost a pint of milk in this exchange .) </Li> </Ul> <Li> A gill is also referenced in "Archer" season 2, episode 3 ("Blood Test") when Barry explains to Archer that a liter is, "about 8 gills". (Eight gills would be 40 Imperial fluid ounces, or 1.13 Liters). </Li>

How much is 1 unit of blood in litres