Slightly off topic but why do bottles size differ

[Charlie C]

IN doing DIY lately I have discovered that many droppler bottles that are supposed to be 3ml actually hold 5ml.
There's no consistency across the board with this.
Any reasons

My tiny brain needs to know

 

[Kropotkin]

My brain must be equally tiny, because I've wondered about the very same thing.

I recently bought a pyrex tank advertised as holding 3ml, but it easily holds 4 and a half.

Could it be that Americans are still completely baffled by the decimal system?

 

[filter]

My brain must be equally tiny, because I've wondered about the very same thing.

I recently bought a pyrex tank advertised as holding 3ml, but it easily holds 4 and a half.

Could it be that Americans are still completely baffled by the decimal system?

it appears you are baffled, since you're calling the metric system the decimal system lol

 

[haiqu]

Maybe they're dram bottles (3.7ml) masquerading as 3ml?

I don't even see why a 3ml bottle would be a standard. I'd have though the preferred sizes in metric would be 5, 10, 20 & 30ml. Yet we see 3ml and 15ml bottles too. Hmmm.

 

[cha0sthe0ry]

My guess is that you are not meant to fill the bottles all the way. Actually helps when steeping so you can shake the liquid. I work at an ecig shop. Our 5ml bottles are 7ml, 10ml bottles are 12ml, you get the picture. They are all slightly larger.

 

[Kropotkin]

it appears you are baffled, since you're calling the metric system the decimal system lol

LOL Well, I did admit to having a tiny brain.

That doesn't explain why it happens, though.

 

[Pappy]

Yes, and it's handy to have a little extra room in the bottles. When I'm steeping a juice, I like to squeeze a little air out of the bottle and suck a little fresh air into it.

My guess is that you are not meant to fill the bottles all the way. Actually helps when steeping so you can shake the liquid. I work at an ecig shop. Our 5ml bottles are 7ml, 10ml bottles are 12ml, you get the picture. They are all slightly larger.