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By weight or by volume?
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stev32k Offline
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Post: #1
By weight or by volume?
When mixing ejuice are the concentrations expressed by weight or by volume and does it make any difference? Volume % is not the same number as weight % there is about 10% difference in the two. The next question is does it make any difference? A 50:50 mix of PG:VG by volume is 45:55 by weight. For nicotine in PG there is about 3.6% difference in weight vs volume. Are those variations enough to be noticeable in the final mix?

I have the ability to do it either way and it seems using weight would be more accurate but would take a little longer. However, if it makes no difference in taste why bother?
17-05-2016 04:13 PM
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Don Offline
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Post: #2
RE: By weight or by volume?
For me, weight is faster, easier and more accurate. In small mixes volume is fine. But when mixing 100ml or more it is easier to use weight. You just plug in the densities for your ingredients - you can treat flavours as straight PG when it comes to density and likewise nic solution as either PG or VG in density.
VG. My nicotine is in PG.

So:
160ml x 1.04g/ml - Flavour 1 = 166.4g
40ml x 1.04g/ml - Flavour 2 = 41.6g
I need 4000mg of nicotine and my solution is 72mg/ml = 55.6ml x 1.04g/ml = 57.8g of nicotine solution

VG is 1.26g/ml so I need 1000-255.6ml = 744.4ml = 938g of VG. I don't normally bother weighing out the VG - I just bung it in a litre bottle to the line I marked earlier when filling the bottle with a kilogram of cold water. Which I then throw a sterilising tablet in to and then wash out a couple of times with hot water before using it.

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17-05-2016 04:25 PM
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fratervapor (05-17-2016)
Don Offline
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Post: #3
RE: By weight or by volume?
Now the sums are done, I can very quickly prepare another litre which will taste exactly the same as the last one.

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17-05-2016 04:26 PM
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TinWhisker Offline
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Post: #4
RE: By weight or by volume?
I mix by volume, but then I don't make any complex juices that require absolute precision.
17-05-2016 04:34 PM
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Michael Offline
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Post: #5
RE: By weight or by volume?
I don't know how they do it in the actual industry of folks making and selling it, but I have considered both options for my personal mixing. From what I understand, mixing by weight is more accurate and better overall, but mixing by volume is simpler. It really doesn't make a difference for personal use, since it's for me and I know if I like something or not and as long as I wrote down the volume of the ingredients, I can reproduce any juice I make that I like so at that point it really doesn't matter whether it's 70VG/30PG or 77VG/23PG, as long as I like it it's fine and it'll be the same every time if I measure it the same way. I measure mine by volume for now, eventually I will probably get a scale and start doing it by weight but for now it's just simpler since I already have what I need. Also, measuring by weight makes more sense if you're mixing bigger batches of juice, but for smaller batches like mixing a bottle or two at a time, by volume is fine. 
17-05-2016 04:42 PM
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TinWhisker Offline
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Post: #6
RE: By weight or by volume?
I'd get a scale and be more accurate (or less haphazard) if I ever do chase down real recipes that require it. It's not like a scale is all that expensive. Now that we're both using the Aromomizer regularly along with the 13/9, we have been hemorrhaging juice lately and I am going to start mixing my own with nic in it, so maybe I do need to get the scale.
17-05-2016 04:46 PM
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Don Offline
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Post: #7
RE: By weight or by volume?
Make sure you get one that doesn't auto power off. This is quite important. On this basis, it is better to get one that uses AAA or AA cells instead of those little lithium coin cells. Check with the seller that it will not switch itself off.

Measuring to 0.01g is accurate enough. A maximum capacity of 1kg should be plenty for most. $20-30 will get you something plenty good enough, this isn't rocket surgery.

The higher the capacity, the higher the cost. If you want to measure milligram differences in 10kg loads - get a life and buy a new car instead. It will be cheaper.

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17-05-2016 05:39 PM
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fratervapor (05-17-2016)
stev32k Offline
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Post: #8
RE: By weight or by volume?
At first I plan to make very small batches of 5 ml until I find something I like. So I guess I'll go by weight. It is easier and more accurate to weigh to 0.1 gram than to measure to 0.1 ml.
17-05-2016 05:57 PM
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fratervapor Offline
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Post: #9
RE: By weight or by volume?
(17-05-2016 04:13 PM)stev32k Wrote:  When mixing ejuice are the concentrations expressed by weight or by volume and does it make any difference?

Recipes are by volume, but calculators will give you the correct weights to use if you go that route.

I think it is faster/easier to work in weights. Mix right into the bottle and the only thing to clean up is a small funnel. I actually got these because at the time they were cheapest. But both are 6mm diameter at the small end and fit into all ejuice bottles I have seen/used.
17-05-2016 11:16 PM
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