How does a normal pipette work?

  • #1
sameeralord
662
3
Hello guys,

This might seem a basic question but my physics is not that good. So in a normal pipette when you squeeze the top bit, do you create an area of high pressure there, and then when you put in a flask with liquid and release it the air escapes, and then the atmospheric air pushes on the liquid and fluid comes into the pipette. Is that what happens? Thanks :smile:
 

Answers and Replies

  • #2
Borek
Mentor
29,002
3,667
Air escapes when you squeeze, regardless of whether you have already put pipette in liquid or not. Other than that seems to me you are right.

--
 
  • #3
sameeralord
662
3
Hello Borek long time,

Ok thanks for the reply. Then why do some people keep the pipette squeezed and then put it into liquid and then release it to get the liquid. When you keep it squeezed haven't you already released the air? So how is air released again when you release it?
 
  • #4
Borek
Mentor
29,002
3,667
There is no difference. Important moment is when pipette is submerged and squezzed. When you stop squeezing rubber creates lower pressure and sucks the liquid. Lower pressure inside, higher pressure on the outside. Whether air left the pipette before it was submerged or after doesn't change the sucking part.
 
  • #5
sameeralord
662
3
Ok I see it was a simple question after all. Thanks for the help Borek.
 

Suggested for: How does a normal pipette work?

Replies
5
Views
951
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
5
Views
5K
  • Last Post
Replies
8
Views
22K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
25K
Top