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A measure of the runniness of a liquid (or gas). A slow-flowing, thick liquid is said to have a high viscosity. So treacle has a high viscosity, water has a low viscosity. In organic chemistry a high viscosity may be the result of extensive hydrogen bonding. |
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The table shows that the viscosity of the alcohols increase with increasing numbers of OH groups available for hydrogen bonding:
|
Liquid |
formula |
viscosity/mPa s |
|
|
Water |
H2O |
0.891 |
|
|
Mercury |
Hg |
1.55 |
|
|
Propan-1-ol |
CH3CH2CH2OH |
2.27 |
|
|
Propane-1,2-diol |
CH3CHOHCH2OH |
46 |
|
|
Propane-1,2,3-triol |
CH2OHCHOHCH2OH |
942 |
