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Converting 70/30 to 80/20

Joe 90 101

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May 21, 2017
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Hi guys, been trying to find easy answer from minds far superior to mine but without long math equations and calculations to think about. I have a bottle of premixed 70/30 vg/pg and bottle of 100% vg.
I just want to know how much of each I need to add to make up say 100ml of 80/20 . ( I should have just got 80/20 or 100% of each I know).
 
Hi guys, been trying to find easy answer from minds far superior to mine but without long math equations and calculations to think about. I have a bottle of premixed 70/30 vg/pg and bottle of 100% vg.
I just want to know how much of each I need to add to make up say 100ml of 80/20 . ( I should have just got 80/20 or 100% of each I know).
Will you be adding flavour concentrates and nic to this mix too, or do just you want 80/20 base for some reason?

If it's the latter, add 50ml of VG to your 100ml of 70/30 mix to make 150ml of 80/20 [emoji4]

Edit: sorry, slightly misread your post; to make 100ml of 80/20 you need 66.7ml of your 70/30 and 33.3ml of VG
 
Conservation of mass law:

CiVi = CfVf

Where Ci and Vi are initial concentration (of PG) and volume
and Cf and Vf are final concentration (of PG) and volume

If you have Ci = 0.3, Vi = 10 mL and are aiming for Cf = 0.2

0.3*10 = 0.2*Vf
Vf = 3/0.2
Vf = 15 mL

i.e. you need to add 5 mL VG to your 10 mL of 70/30 juice to achieve 80/20.

Remember this reduces your nic and flavour strength by 33%
 
Thanks for responses, not as straight forward as you may think or for me at least . Cindy99 gave the sort of answer I was after so assuming it's correct I will go with that. Not worried about percentage of flavour or nicotine as pretty straight forward just wanted to get 80/20 Base mix to work with.
 
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