I bought a pressurized liquid chlorine ampoule online and I was surprised how thick it was. It was more like oil than water. Here's a YouTube video showing someone else with a very similar sample.

I trust my seller but I’m wondering why is it so thick? It doesn’t flow easily.

  • $\begingroup$ The only thing thick is the wall of that ampoule. $\endgroup$ – Karl Jan 5 at 9:54
  • $\begingroup$ I have no idea how big the ampoule is but be very careful, chlorine gas is very bad for your lungs $\endgroup$ – Nuclear Chemist Jan 5 at 13:36

At $\pu{20 °C}$ dynamic viscosity of liquid chlorine is about $\pu{0.35 mPa·s}$ (see Figure 4 from [1, p. 7]), whereas dynamic viscosity of water is about $\pu{1 mPa·s}$, e.g. water is nearly 3 times more viscous at room temperature than liquid chlorine, which should not appear that thick.

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Figure 4. Viscosities of chlorine gas and liquid.

Note that your perception of viscosity and "thickness" may be distorted due to capillary effect if your chlorine sample is sealed in a tiny ampule.


  1. Chlorine: Principles and Industrial Practice, 1st ed.; Schmittinger, P., Ed.; Wiley-VCH: Weinheim; New York, 2000. ISBN 978-3-527-29851-8.
  • $\begingroup$ Capillary effect can make a fluid appear to be more viscous? $\endgroup$ – Ned Tsui Jan 6 at 8:28

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