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Tensiometer, Capillary Surface Tension Apparatus

Item# EW-59780-90

$232.00 USD/EACH

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  • Quickly and easily determine surface tension based on height of liquid in capillary tube
  • Clear, easy-to-read borosilicate glass capillary tube
  • Included rubber stopper centers glass capillary tube in the outer cylinder
Apparatus is comprised of an engraved 250-mm borosilicate glass capillary tube (graduated from 0 to 10 cm in 1-mm divisions) and an outer tube. Capillary tube is positioned in the center of the outer tube by means of a rubber stopper. Outer tube accomodates a pipette bulb to expel air.
What's Included:
250 mm borosilicate glass capillary tube, rubber stopper, and outer cylinder
Product Type Capillary Surface Tension Apparatus
Qty/ea 1

Accessories
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at $20.00 USD/EACH

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at $173.00 USD/EACH

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Questions and Answers

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get answers from real customers and in-house experts with AnswerBox.

15 Questions | 15 Answers
Displaying questions 1-10Previous | Next »
  • Q:

    what would be the normal reading for water.
    Asked on 9/19/2012 by howie otinsky from New Jersey

    1 answer

    • STAFF EXPERT

      A:

      Surface tension is influenced by temperature. The following table give temperature in degrees Celsius and surface tension in dynes per centimeter, which is equivalent to milliNewtons per meter.

      Liquid Temp Surface Tension
      Water 0 75.64
      Water 25 71.97
      Water 50 67.91
      Water 100 58.85

      Answered on 9/21/2012 by Christina from Technical Support
  • Q:

    How does this apparatus corrects for the effect of contact angle? Does it assume perfect wetting conditions?
    Asked on 5/18/2012 by Anonymous

    1 answer

    • STAFF EXPERT

      A:

      The surface tension apparatus does not correct for contact angle, it assumes a 90 degree contact angle. However you can look at the curvature of the mensicus to tell whether or not you have good wetting conditions.

      Answered on 5/22/2012 by Jack from Technical Support
  • Q:

    I have no access to benzene, chromic acid or methanol. What other chemicals can be used to clean the capillary tube after use or for calculating the radius?
    Asked on 10/11/2011 by kc123 from AL

    1 answer

    • Staff Reviewer

      A:

      We have no other suggestions. Methanol, also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits should be easily found at a paint/hardware store.

      Answered on 10/12/2011 by Jen from Technical Support
  • Q:

    What concentration of chromic acid would you suggest for cleaning?
    Asked on 7/15/2011 by Anonymous

    1 answer

    • STAFF EXPERT

      A:

      Often times a chromic acid isn't needed if you are testing waters or alcohols. If you have liquids with dissolved solids or materials that leave residues, then chromic acid at a 5% concentration can be used.

      Answered on 7/20/2011 by Mike from Tech Support
  • Q:

    Can the surface tension apparatus be ordered with a NIST traceable calibration certificate?
    Asked on 12/15/2010 by Anonymous

    1 answer

    • STAFF EXPERT

      A:

      This unit does not have a NIST certificate available for it.

      Answered on 12/17/2010 by Mike from Tech Support
  • Q:

    What are overall dimensions of apparatus? What is typical radius of capillary tube? Trying to figure out how much sample is required. Description says outer tube accomodates rubber tubing, is a vacuum applied to apparatus?"
    Asked on 8/16/2010 by over my head from columbus ohio

    1 answer

    • STAFF EXPERT

      A:

      The overall height of the cylinder is 250mm. The inside height of the cylinder is 235mm. The O.D. of cylinder 40.1-41.9mm. The I.D. of the cylinder is 35.7-38.3mm.
      The capillary tube OD is 5.5mm and the ID is 0.5mm.
      There is a small vacuum applied to remove the air from the cylinder. This is typically accomplished with a pipet filling bulb.
      We do have detailed instructions of the procedure available however we can't attach a file through answer box. If you email techinfo@coelparmer.com you can request the instructions and we can send them out to you.

      Answered on 8/18/2010 by Mike from Tech Support
  • Q:

    What is the surface tension range that can be measured with this apparatus? How to measure the surface tension - can it be read directly from the scale - are further calculations needed?
    Asked on 7/16/2010 by Scientist 2010 from Uk

    1 answer

    • STAFF EXPERT

      A:

      The range of surface tension will vary based on the properties of the material being measured; however, it should be able to read surface tension of most liquids.

      The formula for determining surface tension is y=(1/2)h*r*d*g. y-the surface tension in dynes (dynes/cm) h-the distance between the menisci (cm) r-the radius of the tube (cm) d-density of the sample (g/mL) g-acceleration due to gravity (cm/s^2).

      Answered on 7/21/2010 by David from Tech Support
  • Q:

    What is the minimum volume that can be tested in this apparatus?
    Asked on 6/11/2010 by CS from Chicago, IL

    1 answer

    • Staff Reviewer

      A:

      The exact minimum volume is not known, but the cylinder needs at least enough liquid to cover the tip of the capillary tube.

      Answered on 6/11/2010 by Jen from Technical Support
  • Q:

    Will this device measure the Surface tension of water to 0.03 N·m–1 or less?
    Asked on 4/5/2010 by RA from Fremont, CA

    1 answer

    • STAFF EXPERT

      A:

      This apparatus can be used to determine the surface tension of water.

      The accuracy of the measurement is primarily depending on your laboratory technique, and also on the uncertainty in the bore dimension.

      Answered on 4/9/2010 by David from Tech Support
  • Q:

    is it possible to order just a glass tube in case one is broken?
    Asked on 3/3/2010 by Anonymous

    1 answer

    • STAFF EXPERT

      A:

      Replacement glass capillary tubes can be purchased as the part-number 59780-95.

      Answered on 3/5/2010 by Josh from Technical Support
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Product Reviews

REVIEW SNAPSHOT®

by PowerReviews
Surface tension apparatus
 
4.0

(based on 1 review)

Reviewed by 1 customer

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(2 of 2 customers found this review helpful)

 
4.0

Good and simple aparatus

By Aleksa

from Fort Worth, TX

About Me Academic/Professional Researcher

Verified Buyer

Pros

  • Durable
  • Easy To Use
  • Works Properly

Cons

  • Inaccurate

Best Uses

  • In The Lab
  • Research

Comments about Surface tension apparatus:

The analysis with this tensiometer is quick and easy. However, to determine the surface tension of pure water is very hard, it is basically imposible to clean this apparatus enough to get accurate number. On the other hand, all surfactant solutions I tested were in fairly good agreement with literature data.

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