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Converting 70/30 to 80/20

Discussion in 'General Chat' started by Joe 90 101, May 25, 2017.

  1. Joe 90 101

    Joe 90 101 Initiate

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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).
     
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  3. mattyk2010

    mattyk2010 Veteran

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    90ml VG/PG 10ml VG
     
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  4. mattyk2010

    mattyk2010 Veteran

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  6. cindy99

    cindy99 Achiever

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    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

    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
     
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  7. danb

    danb Achiever

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    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%
     
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  8. danb

    danb Achiever

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    Nope, this gives 73/28 VG/PG
     
  9. mattyk2010

    mattyk2010 Veteran

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    Sorry half asleep
     
  10. Joe 90 101

    Joe 90 101 Initiate

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    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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  11. Leeren666

    Leeren666 Achiever

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    Really ? Surely it can't be more than 100% ?
     
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  12. Joe 90

    Joe 90 Achiever

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    Because there is only one Joe 90;)
     
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