Surface tension

  • Thread starter shamstar
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  • #1
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i am doing a physics assignment on the realationship between surface tension and temperature. i have calculated the surface tension at various temperatures using a capillary tube and measuring the height. i was given the formula:
surface tension=(densityxradius of tubeheight of columnxgravity)/ 2
i have calculated the surface tension, however, im not sure what units it is in. density was measured in g/mm^2, radius and height were measured in mm, gravity was measured in mm/s. im not sure if the answer will be dyns/cm or ergs/cm^2? or even something else? thankyou
 

Answers and Replies

  • #2
318
0
i am doing a physics assignment on the realationship between surface tension and temperature. i have calculated the surface tension at various temperatures using a capillary tube and measuring the height. i was given the formula:
surface tension=(densityxradius of tubeheight of columnxgravity)/ 2
i have calculated the surface tension, however, im not sure what units it is in. density was measured in g/mm^2, radius and height were measured in mm, gravity was measured in mm/s. im not sure if the answer will be dyns/cm or ergs/cm^2? or even something else? thankyou
First of all convert all the mm reading to cm. Also measure the density in gms per cm^2 and g as cm/s^2. Now you will get in dynes/cm.
 
  • #3
surface tension=force*length.

[tex]f=MLT^{-2}[/tex]
Hence surface tension=[tex]ML^2T^{-2}[/tex]
 
  • #4
318
0
surface tension=force*length.

[tex]f=MLT^{-2}[/tex]
Hence surface tension=[tex]ML^2T^{-2}[/tex]
I think that you have made some mistake. Surface tension is force/length.It is torque which is force*length(radius). So surface tension would be ML^0T^-2
 
  • #5
10
0
thanyou both so much. lets hope a get an A on my assignment! thanks again
 

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