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#31
09-29-2010, 04:23 PM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

Seriously! I just want to know how many drops in a milliliter!! I don't care about anything else. Get a life!!!
#32
10-21-2010, 03:21 PM
 anyone1967 Junior Member Join Date: Oct 2010 Posts: 1 Rep Power: 0
Re: how many drops in milliliter?

OK, in Nursing and Medicine, there are 15 -16 drops in one milliliter. Hope that helps!
#33
11-12-2010, 06:14 PM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

Ok:

1. This question cannot accurately be answered. Some industries / scientists / etc. use different conventions to conveniently estimate the number of drops to ml's, those conventions are for conveniences sake only and are influenced by any number of factors.

2. Wikipedia is roughly as accurate as encyclopedia britannica according to studies. Don't believe me? Read it on CNET.

news.cnet.com/2100-1038_3-5997332.html

3. For the purposes of an OTC pharmaceutical estimate, basic measuring for non-life safety applications, you can be safe with the 20-drop/ml estimate. Dribble the substance at a constant rate of pressure so that it "naturally" drops away. Use an eyedropper with a semi standard style opening. Allow liquids to come to room temperature before dripping if greater precision is required.

4. If this level of detail is not good enough, get some functional training in chemistry. You're going to need it to mathematically determine the molecular weight per ml of mixtures. Once you have that and a serious scale you can measure to your hearts content. If you can't hang that, at least get a finely calibrated tiny graduated cylinder. Some of the tiny ones have subdivisions substantially less than 1ml. Make sure you measure from the Meniscus and good luck!

Ex Lux
#34
01-05-2011, 05:12 PM
 chethanjungir Guest Posts: n/a
Re: how many drops of thioglycolic acid makes 1 milliliter?

how many drops of thioglycolic acid makes 1 millilitre
#35
01-06-2011, 07:15 AM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

Regarding medmath, there are 15 drops in a milliliter.
#36
01-11-2011, 04:31 PM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

Quote:
 Originally Posted by Unregistered How many drops are in one milliliter?
how many drops in one milliliter ?
#37
03-10-2011, 10:24 AM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

There are a number of variables to consider. Most importantly, I have not seen any responses in this thread that have inquired relative to the container and dispensing system. Additionally, viscosity of the solution being dispensed should be afforded consideration as well, as viscosity is dynamic...water even changes viscosity depending on temperature.

With that said, if this is an ophthalmic solution, most bottle and tip manufacturers will publish a drop size around 40ul (microliters) for their standard tip. However, the reported range for a drop dispensed is anywhere from 35-50ul. There are 1000ul:1mL. Therefore, if you assumed that each drop were 40ul, you would get approximately 25 drops per mL of solution. So, a standard 15mL boston round bottle containing a standard (non-gel) artificial tear, with a TRUE fill rate of 15mL, should produce close to 375 drops. Another thought...the eye only can hold 6-7 ul of fluid...so the real question: "Why such a large drop size?"...to be continued!

p.s. the eye produces about 0.5-2.2 ul of tears each minute...
#38
03-14-2011, 06:24 PM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

How many drops are in one milliliter?
#39
03-15-2011, 11:27 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,296 Rep Power: 11
Re: how many drops in milliliter?

Quote:
 Originally Posted by Unregistered How many drops are in one milliliter?
Suggest you read the last 4 pages of posts, and pick a number.
#40
03-29-2011, 01:58 PM
 Unregistered Guest Posts: n/a
Re: how many drops in milliliter?

I counted 160 drops to fill a graduated cylinder to 10 ml with RO water. Therefore, my dropper dispenses 1 ml in 16 drops. The best way to know for sure with your liquid and your conditions is to count drops. The standard of 20 was WAY off in my application. I think the 20 drop standard could be more about building profits into drug prescriptions.

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