Question

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a phenomenon based on exosmosis
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Answer 1

The level in the capillary tube increases because of the fact that osmotic pressure of the sugar solution is higher than that of the water, and the water moves through the semipermeable membrane of potato from petri-dish into the cavity. So the experiment shows that phenomenon of osmosis.

Answer 2

Answer:

When two liquids of different densities or chemical

types are separated by a thin, permeable partition, two

currents of unequal strength flow in opposite directions

across the partition. The result is that liquid accumu-

lates progressively on the side towards which the

strongest flow is directed. I have called the two currents

endosmosis and exosmosis because they occur in the

hollow organs constituted of organic tissue. The results

of my experiments suggest that this phenomenon is not

exclusive to organic membranes, and can be detected

across very thin, porous, inorganic strips. The phenom-

enon requires that the permeable partition is extremely

thin. It does not occur, for example, across a 4 mm thick

permeable partition, whereas a 1 mm thick partition is

appropriate. Regardless of thickness, however, the two

types of porous strip ought to exert equal capillary

action, and to filter equal amounts of water in a given

time, It appears, therefore, that extremely close contact

between the two heterogeneous liquids is one of the

necessary conditions for the phenomenon to occur. I

shall dispute the claim of the renowned mathematician

Monsieur Poisson that it does not depend only on cap-

illarity. His theory can be summarized as follows 1.

Consider a liquid the height of which is inversely

proportional to its density. When two such liquids of

different densities are separated by a partition consist-

ing of capillary canals permeable to both liquids, the

Presented at the French Royal Academy of Sciences, 23 July 1827