Elementary Lessons in the Physics of Agriculture

Cover Elementary Lessons in the Physics of Agriculture
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83. Iiilliieiice of Surface Tension on Lactometer Reading's. — The rise of water on the sides of a tube tloat- iny- in it, as in the case of the lactometer, tends to draw it more deeply into the liquid and thus gives it a higher read- ing. On the other hand, if the liquid has its surface tension weakened by being overspread with oil, or if the stem of the lactometer is made greasy by handling or otherwise, it will then be lifted out of the liquid and too low a read- ing vvill be indicated. It i
...s important, therefore, in de- termining the specific gravity of milk by this method to see that the lactometer is thoroughly clean.
84. Solution of Solids in Liquids. — When salt is placed in water the adhesion between the molecules of water and salt is at tirst stronger than the cohesion between the molecules of salt, and successive layers of salt molecules are separated and disseminated through the liquid. If the quantity of salt placed in the water be large enough, there will come a stage when the quantity of salt dissolved in the water has so weakened its adhesive power that it ceases to be strong enough to overcome the molecular cohesion of the salt and at this stage further solution is stopped.


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