TOPIC:

actually, JH has not changed that.

It appears the "drop" method is subjective with accuracy . So a beaker may be the best route...until you pour the solution out and loose some solution to the sides of the beaker. Maybe this isn't rocket science and the SWAG(scientific wild a** guess) method is acceptable.

Yes Vector, a beaker will be better...
And that is my idea to go CDS, still not tried, since qty is higher, I could use a "kids antibiotic measurement beaker" (8sorry about that ) to dispense.
So, thanks for the idea!

Jorge

I have heard Jim Humble say (on a video)
"this isn't rocket science" so I'm guessing there's a little sway.

Charlotte,maybe it's in the way you hold it - or the viscosity of the fluid - or the temp of the fluid - when I tested, room temperature (and I never hold mine straight upside down, always at an angle) and I tested several times, it was 24 drops, as I recall. JH has stated 25 drops. Mine was close enough for me.

To make it even more confusing:


The volume of a drop is not well-defined: it depends on the device and technique used to produce the drop and on the physical properties of the fluid. This is similar to units like the cup, tablespoon, and teaspoon that depend on the spoon or cup.

There are several exact definitions of a "drop":

the "metric" drop, 1/20 mL (50 μL).
the medical drop, 1/12 mL (83 1/3 μL).
the Imperial drop, 1/36 of a fluidram (1/288 of an Imperial fluid ounce, or 1/1440 of a gill) (approximately 99 μL).

an alternate, possibly apocryphal, definition of the drop is 1/1824 of a gill (approximately 78 μL).
the U.S. drop, 1/60 of a teaspoon or 1/360 of a U.S. fluid ounce (approximately 82 μL).
an alternate definition of the U.S. drop is 1/76 of a teaspoon or 1/456 US fl oz (approximately 65 μL).
According to Webster dictionary, "drop" indicates the smallest volume of a liquid that may be measured. The size of drop may vary with the viscosity of the liquid.

In the past, a drop was another name for a minim. This meaning was used in Pharmacy to describe a volume equal to one 60th of a fluid dram or one 480th of a fluid ounce. This is equal to about 0.0616mL (U.S.) or 0.0592mL (Britain). Pharmacists have since moved to metric measurements, with a drop being rounded to exactly 0.05mL (that is, 20 drops per millilitre). In hospitals, intravenous tubing is used to deliver medication in drops of various sizes ranging from 10 drops/mL to 60 drops/mL. A drop is abbreviated gt, with gtt used for the plural. These abbreviations come from the Latin for drop, gutta.[1] articles.

A drop can also be used less formally as a unit of volume in recipes. According to some older kitchen references, 24 drops = ¼ teaspoon. Using U.S. definitions, this makes the drop equal to about 0.051mL, making it quite comparable to the pharmacist's drop.[1]

^ a b Russ Rowlett. How Many? A Dictionary of Units of Measurement. University of North Carolina (2005-17-11). Retrieved on 2006-09-07.
Retrieved from wikipedia

So to paraphrase....the size of drops are not extremely important as long as they are not dispensed with a bucket.

hehehe, correct Vector.
Only issue is not to get too much, so you get upset, mainly due citric acid
regards