Hello,
What is the surface tension of Sodium chloride (NaCl) 0.9% (saline solution)?
At air/liquid interface
At 25 °C (and 20 °C)
Thank you in advance for your help 😊
The surface tension of water varies considerably even with trace amounts of other substances. I went to great lengths to measure the surface tension and finally settled on measuring droplets. Even if you found a table of surface tensions online with a range of saline concentrations, that wouldn't guarantee that your water with the same saline concentration would have the same surface tension. If you really care, it's best to measure it yourself. Even distilled, deionized water isn't as pure as you might think.
Assuming it is weight percent, 0.9% is 154 mmol/kg, corresponding to an increase in the surface tension by 0.25 mN/m (from 72.20 to 72.45 mN/m at room temp.)
Ref.: doi.org/10.1016/j.jcis.2012.07.020
Please note, that also the type of water you use to dissolve NaCl may have an influence on the surface tension (gradient). While studying the coalescence behaviour of bubbles in water, there was a clear difference between distilled water and tap water. And your tap water may be different from our tap water. 100% pure water does not exist and the always present 'impurities' may have a considerable effect.
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