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General Science => General Science => Topic started by: neilep on 21/10/2007 17:59:08

Title: What Determines The Size Of drops ?
Post by: neilep on 21/10/2007 17:59:08
See these Pipettes !

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Two questions ?

What determines the size of a drop out of each pipette ?..I presume different size ends will give different size drops yes ?



And..why are they called Pasteur Pipettes ?....did he also invent the Pipette ?...is it as simple as that ?

Title: What Determines The Size Of drops ?
Post by: Karen W. on 21/10/2007 18:55:17
The top part of the squeezer portion and the thinner diameter tubes however minimal, add to, and determine the droplet size I believe!
Title: What Determines The Size Of drops ?
Post by: Karen W. on 21/10/2007 19:01:17
The top has so much space to hold a certain amount of water thus the diameter of the tube can accomodate the bigger amounts of the water allowing a larger drop to be formed at tip.

I am not qualified to add my two cents, but that would be a pure guess and observation on my part! LOL
Title: What Determines The Size Of drops ?
Post by: neilep on 21/10/2007 19:43:08
Seems like good guesses to me karen mam.

So, if the pipette could hold even more liquid it could eventually  make a very big drop ?...hmmmmmm !!!..

I thought the size of the hole where the liquid comes from might have something to do with it !!
Title: What Determines The Size Of drops ?
Post by: Karen W. on 21/10/2007 21:54:53
Yes I think so two.. if you look at your three samples each hole is just a

tiny bit bigger, it seems to me, which would allow for more volume I

would think! Thus the reason for the bigger reservoir.At least that would be my guess. The tip size is almost unnoticeable..More water would be more weight per drop wouldn't it? So if the tips were all the same how could they accommodate the amount of water to enlarge the droplet size..

I think you are right!!!
Title: What Determines The Size Of drops ?
Post by: Karen W. on 21/10/2007 21:56:56
So if the tips were the same perhaps it wouldn't matter how much water the bulb held because the tip would determine the amount that could actually pass through the opening..... You must be right!
Title: What Determines The Size Of drops ?
Post by: eric l on 22/10/2007 08:43:37
I'm affraid most of the guesses are wrong.
Title: What Determines The Size Of drops ?
Post by: Karen W. on 23/10/2007 01:00:36
You know.. as I read that it makes perfect sense and Neily was right about the tip.. I had wondered if thicker liquid would change the size of the drop but I thought nahhhh! LOL see what I know.. LOl when you said that about the air suddenly my brain went to thanksgiving dinner and using the turkey baster to suck up and push out liquid over the bird!... Nice job eric and neil!
Title: What Determines The Size Of drops ?
Post by: stefny on 21/10/2010 14:52:14
Hello,
Nice post
sorry, i am new register for this site
so please guide me
Thanks

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