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About Surface Tension Of Water
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Waters cohesiveness due to hydrogen bonding manifests itself in three ways. To begin with water drops tend to be spherical. The surface of water behaves much like a membrane. The molecules on the surface or membrane through hydrogen bonding link to one another and to the molecules of the interior of the droplet. In an effort to assume a minimum surface to volume configuration or sphere the molecules press inward. Water also has the ability to support surface gliding insects and broad flat objects is an example of waters cohesiveness. Lastly this cohesiveness results in waters tendency to resist flowing. This is known as viscosity.
Surface Tension of Water Against Air
| to | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 100 |
Surface Tension
dynes/cm |
75.6 |
74.2 |
72.8 |
71.2 |
69.6 |
67.9 |
66.2 |
64.4 |
62.6 |
58.9 |
Another thing caused by hydrogen bonding is waters ability to adhere to dissimilar substances. A good example of this is waters ability to conform to say a test tube is caused by the formation of hydrogen bonds between the water molecules adjacent to the test tube wall and the molecules in the wall. In addition waters ability to creep far up a capillary tube is also due to hydrogen bonding between water molecules and the molecules in the capillary wall. This action is the mechanism by which water moves through soil for plants.
Viscosity of Water
| toC | Centiposies | toC | Centiposies | toC | Centiposies |
| 0 |
1.792 |
35 |
0.723 |
70 |
0.406 |
| 5 |
1.519 |
40 |
0.656 |
75 |
0.380 |
| 10 |
1.308 |
45 |
0.599 |
80 |
0.357 |
| 15 |
1.140 |
50 |
0.549 |
85 |
0.336 |
| 20 |
1.005 |
55 |
0.506 |
90 |
0.317 |
| 25 |
0.894 |
60 |
0.469 |
95 |
0.299 |
| 30 |
0.801 |
65 |
0.436 |
100 |
0.284 |
More Information About Water
Molecular Structure
The Three States
Sublimation
Supercooled Water
Heavy Water
Properties
Heat Capacity
Latent Heats
Solvent
Surface Tension of water
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