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The '''stalagmometric method''' is one of the most common methods for measuring [[surface tension]]. The principle is to measure the weight of the drops of the fluid falling from the capillary [[glass tube]], and then calculate the surface tension of the specific fluid which we are interested in. We know the weight of each drop of the liquid by counting the number of the drops falling out. From this we can determine the surface tension
<ref name="name1">{{cite journal
|author=Sergey V. Chichkanov, Victoriya E. Proskurina, Vitaly A. Myagchenkov
|title=Estimation of Micelloformation Critical Concentration for Ionogenic and Non-Ionogenic Surfactants on the Data of modified Stalagmometric Method
|journal=Butlerov Communications
|volume=3
|year=2002
|issue=9
|pages=33–35
|url="http://chem.kstu.ru/butlerov_comm/vol3/cd-a5/data/jchem&cs/english/n9/full/33-36.pdf"}}
</ref>
<ref name="name2">http://www.fpharm.uniba.sk/fileadmin/user_upload/english/Fyzika/The_surface_tension_of_liquids_measured_with_the_stalagmometer.pdf</ref>
 
== Stalagmometer ==
[[Image:Stalagmometer.JPG|thumb|250px|right|A stalagmometer, straight form.]]
A stalagmometer is a device for investigating surface tension using the stalagmometric method. It is also called a stactometer or stalogometer. The device is based on a capillary glass tube whose middle section is widened. In terms of the volume of the drop, it could be calibrated to the same size based on the design of the stalagmometer. The part of the bottom of the device is narrowed down to let the fluid fall out from the tube in a shape of drop.<ref name="name2" /><ref name="name4">http://history.nih.gov/exhibits/galleries/instrument/2.html</ref>
In the experiments, the drops of the specific fluid are flowing slowly from the tube in a [[vertical direction]]. The drops hanging on the bottom of the tube start to fall when the volume of the drop reaches the maximum value which is dependent on the characteristic of the solution. In this moment, the weight of the drops is in an [[Thermodynamic equilibrium|equilibrium state]] with the surface tension. Based on the Tate’s law:<ref name="name3">T. Tate, Philos. Mag. 22, 176 (1864).</ref>
 
<math>\ mg=2\pi r \sigma</math>
 
The drop is falling when the weight (mg) is equal to the circumference (2πr) multiplied by the surface tension (σ). The surface tension can be calculated provided the radius of the tube (r) and mass of the fluid droplet (m) are known. Alternatively, since the surface tension is proportional to the weight of the drop, the fluid of interest may be compared to a reference fluid of known surface tension (typically water):
 
<math>\frac {m_1}{\sigma_1}=\frac {m_2}{\sigma_2}</math>
 
In the equation, m<sub>1</sub> and σ<sub>1</sub> can be the mass and surface tension of the reference fluid, and m<sub>2</sub> and σ<sub>2</sub> can be the mass and surface tension of the fluid we want to investigate. If we take water as a reference fluid, then:
 
<math>\sigma=\sigma_{H_2O}\times\frac {m}{m_{H_2O}}</math>
 
If the surface tension of water is known, we can calculate the surface tension of the specific fluid from the equation. The weight of more drops we measure, the more precise we calculate the surface tension from the equation.<ref name="name2" /> One thing we need to notice is that keeping the stalagmometer clean is really important so as to get meaningful reading. There are commercial tubes for stalagmometric method in three kinds of size: 2.5, 3.5, and 5.0 (ml). The size of 2,5 (ml) is suitable for small volume and low viscosity, of 3.5 (ml) for relatively high viscous fluid, of 5.0 (ml) for large volume and low viscosity, 2,5 (ml) for small volume and high viscosity and are flexible for different size of most of the fluids.<ref name="name5">http://www.wilmad-labglass.com/group/1632</ref>
"Survismeter" produces ultra accurate results of surface tension along with viscosity, interfacial tension, wetting coefficient and density data. The survismeter is most accurate and safer for volatile, inflammable and carcinogenic liquids.
 
== Modified method ==
During the experiment, we may sizes of the drops each time, thus reduce the precision of value of the surface tension. The stalagmometric method was currently improved by S. V. Chichkanov and his colleagues<ref name="name1" /> that they modify the experiment to measure the weight of the drops in a fixed number rather than directly measure the number of the drops. The modified method to determine the surface tension based on the weight of the drops in a fixed number can be more precise than the original method based on the number of drops, especially for the fluid which surface is highly active. The advantage of the modified method is that it actually get more precise value of the surface tension and reduce the duration of experiments.<ref name="name1" />
 
== References ==
{{Reflist}}
 
{{DEFAULTSORT:Stalagmometric Method}}
[[Category:Fluid mechanics]]

Latest revision as of 00:11, 8 January 2015

Surely the second option would be more beneficial for any website. Medical word press themes give you the latest medical designs. These templates are professionally designed and are also Adsense ready. Transforming your designs to Word - Press blogs is not that easy because of the simplified way in creating your very own themes. It's as simple as hiring a Wordpress plugin developer or learning how to create what is needed.

Thus, it is imperative that you must Hire Word - Press Developers who have the expertise and proficiency in delivering theme integration and customization services. Infertility can cause a major setback to the couples due to the inability to conceive. This plugin is a must have for anyone who is serious about using Word - Press. They provide many such popular products which you can buy for your baby. That's a total of 180$ for each Wordpress theme if you sell 3 links and keep the designer link for your own website, or 240$ if you sell all links.

It is very easy to install Word - Press blog or website. Word - Press has ensured the users of this open source blogging platform do not have to troubleshoot on their own, or seek outside help. You can now search through the thousands of available plugins to add all kinds of functionality to your Word - Press site. You or your web designer can customize it as per your specific needs. There are plenty of tables that are attached to this particular database.

The primary differences are in the plugins that I install, as all sites don't need all the normal plugins. I have compiled a few tips on how you can start a food blog and hopefully the following information and tips can help you to get started on your food blogging creative journey. However, you may not be able to find a theme that is in sync with your business. It supports backup scheduling and allows you to either download the backup file or email it to you. OSDI, a Wordpress Development Company based on ahmedabad, India.

When you have any questions with regards to exactly where and how to use backup plugin, you possibly can contact us at the web-site. Someone with a basic knowledge of setting up a website should be able to complete the process in a couple of minutes however even basic users should find they are able to complete the installation in around 20 minutes by following the step by step guide online. Here's a list of some exciting Word - Press features that have created waves in the web development industry:. While deciding couple should consider the expertise of the doctor,clinics success rate,the costs of fertility treatment,including fertility tests and IVF costs and overall ones own financial budget. Web developers and newbies alike will have the ability to extend your web site and fit other incredible functions with out having to spend more. However, if you're just starting out your blog site or business site, you can still search for an ideal theme for it without breaking your bank account.

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