Do i have this right?

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yepimonfire

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Lets say i have 100mg/ml nic liquid that is 99% PG

now lets say i want to make a 25mg/ml batch of juice that is ~75pg25vg

lets say i take 1ml of 100mg nic liquid. now i add 2ml of pure PG and 1ml of vg.

if i have this right this means i have cut the liquid into 1/4th of its strength. the nic is already PG, so by adding 2mls of PG i have 3ml of PG and 1ml of VG making it ~75/25 and cutting it down to 25mg/ml.

amidoinitrite.jpg?
 

GoodDog

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You shouldn't be working with 100mg nicotine, especially if you have to ask this question. It's very dangerous and too easy to make a mathematical error which could end you up in the hospital. Before attempting DIY be sure to read all the stickies on the main page, especially the ones on safety. Your 100mg nicotine should be diluted down to a safe level before using it in mixes. Then you work from the diluted mixture. Please don't work from 100mg. Even experienced DIYers don't do that. i've been DIYing for almost 2 years and I'm too afraid of 100mg to buy it. I hope you're wearing full safety gear, eye protection and working in a well ventilated clean room.
 

Tona Aspsusa

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Dec 13, 2011
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60 ml nic = 6% volume
100ml nic = 10% volume

What do you mean by "60 ml nic"? Do you mean pure nicotine? Or do you mean the more common 60mg/ml solutions of nicotine in PG or VG?

Now, PG and VG aren't exactly water, but they are close enough that we can use water's handy dandy correspondences between volume and weight:

1 ml weighs 1 gram = 1000 milligrams = 0.001 kilograms

What makes this confusing, even for us who have never used anything but the metric system, is that the correspondences aren't milli-milli, centi-centi or deci-deci.

They are:
Litre = Kilogram
Deciliter = Hectogram
Centiliter = Decagram
Milliliter = Gram

Now, one Gram is 1000 Milligrams, one Litre is 1000 Milliliters.

Where this gets really confusing is the fact that one Litre (water) weighs 1000 Grams, and one Gram (of water) has the volume of 1 Milliliter.

We snotty Europeans often like to say that the metric system is sooo logical and simple and we just can't understand why anyone uses anything else. This is true, but we do forget that if one doesn't have an everyday "feel" for just how much volume is in one litre (a bit more than a NA quart), how much it weighs (a bit more than 2 pounds I believe), or how much 1ml is (1/4-1/5th teaspoon) and how much that weighs (1 gram - sorry I have no idea what the corresponding NA everyday unit would be), the names of the units can be very confusing.

So, in one ml of water, there is one gram or 1000 mg mass. Which is why 100mg/ml nicotine solution is sloppily called 10%, or less sloppily 10% weight/volume.

Units and precision matter!

Now, I would love it if some chemist or science teacher could explain the finer points of the volumes of solutions - what exact volume *does* adding 100mg of nicotine to 1 ml of PG give us?
I know that when I add a tablespoon (15ml) of tablesalt to a deciliter (100ml, a bit less than 4 fl oz), I do not end up with 115 ml salt water, I end up with considerably less (maybe 103 - 105 ml). And I can't quite believe the explanation is that tablesalt is 2/3 air... :confused:
 
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