Calculating surfactant tail volume of a lipid

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The discussion centers on the packing parameter equation used to determine the arrangement of lipids. The user expresses confusion regarding the surfactant tail volume (v) and seeks clarification on the variable 'b,' which is identified as the base area. There is also a concern about the critical chain length (l) in the equation, noting that its inclusion leads to cancellation, making the packing parameter independent of l. The user is looking for assistance due to a lack of support from their lecturer.
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This is the general equation for the packing parameter to find out what shape the lipids arrange into:

T0aqwct.jpg


And this is what we have been given in class:

http://i.imgur.com/iGsbXHi.jpg



I'm struggling with the surfactant tail volume, v term. I understand the a is the optimal surface area of the head, but what is b?

I've looked everywhere and no where else has the b. Also if the v term has an l (critical chain length) in it then when inserted into the packing parameter equation the l's cancel and it's no longer dependant on l.

If someone could help it would be really appreciated as the lecturer has gone AWOL and doesn't reply to emails so I'm stuck.
 
Update: b is the base area
 
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