Jaeger's method to find the surface tension

In summary, the jaeger method for finding surface tension of liquids has the advantage of not requiring the measurement of contact angle. However, there is confusion regarding the use of radius in the equation when the contact angle is zero, and how the contact angle of mercury, which is typically obtuse, can result in a zero contact angle for the equation.
  • #1
shalikadm
63
0
I'm studying for the exam day after tommorow and while reading the practical on jaeger method I found the following...

P1-P2=2T/ r
r is the radius of the capillary tube
.....
advantages of this method..,
•contact angle is not needed
•can find surface tension of liquids like mercury

my concern is as following...
we replace r with R(radius of the meniscus ) of the equation P1-P2=2T/R when the contact angle is zero. So how it can say that the contact angle is not needed. and also while the contact angle of mercury is an abtuse angle how it becomes zero for the equation ?

this is so urgent and quick response is highly appreciated...
thanks in advance !
 
Physics news on Phys.org
  • #2
shalikadm said:
we replace r with R(radius of the meniscus )
Not sure what is meant by that. How are you defining radius of meniscus that makes it different from the radius of the capillary?
shalikadm said:
how it can say that the contact angle is not needed
I agree. E.g. with a 90° contact angle, the surface tension would not affect the pressures.
 

1. What is Jaeger's method to find the surface tension?

Jaeger's method is a technique used to measure the surface tension of a liquid by observing the shape of a liquid drop on a solid surface. It involves measuring the diameter of the liquid drop and calculating the surface tension using a mathematical formula.

2. How accurate is Jaeger's method in determining surface tension?

Jaeger's method is considered to be a highly accurate technique for measuring surface tension. With proper equipment and careful measurements, it can provide results with an accuracy of up to 1%. However, the accuracy may vary depending on experimental conditions and user technique.

3. Can Jaeger's method be used for all types of liquids?

Yes, Jaeger's method can be used for a wide range of liquids, including water, oils, and even complex mixtures. However, it may not be suitable for highly volatile liquids or liquids with low surface tension.

4. What are the advantages of using Jaeger's method over other methods for measuring surface tension?

One major advantage of Jaeger's method is its simplicity and low cost. It requires minimal equipment and can be easily performed by one person. Additionally, it does not require any special preparation of the liquid sample.

5. Are there any limitations or drawbacks of using Jaeger's method?

One limitation of Jaeger's method is that it may not be suitable for measuring surface tension at very low or very high temperatures. It also requires a skilled operator and careful measurements to obtain accurate results. Additionally, it may not be suitable for liquids with complex surface properties.

Similar threads

Surface Tension and Capillary Rise
    • Mechanics
Replies
1
Views
843
A Confusion of the scale of contact line dynamics and capillary flow
    • Mechanics
Replies
1
Views
1K
Is this a valid way to calculate capillary force / pressure?
    • Mechanics
Replies
8
Views
1K
Surface Tension and force required to pull a thin ring
    • Mechanics
Replies
4
Views
4K
Capillary and liquid tension problem
    • Mechanics
Replies
3
Views
885
Height of a stable droplet on a perfectly wetting surface
    • Introductory Physics Homework Help
2
Replies
63
Views
2K
Problem on Pressure due to Surface tension
    • Introductory Physics Homework Help
Replies
1
Views
823
What Are Simple Methods to Measure Surface Tension at Home?
    • Mechanics
Replies
1
Views
3K
Calculating Capillary Height with Surface Tension: A Question on Homework
    • Introductory Physics Homework Help
Replies
1
Views
2K
Calculating surface tension with the Capillary Equation
    • Introductory Physics Homework Help
Replies
29
Views
3K

Hot Threads

Recent Insights

Back
Top