What is capillarity? Give two practical illustrations of capillarity.
(N/A) Capillarity is the phenomenon of the rise or fall of a liquid in a capillary tube (a tube with a very fine bore) when it is dipped in the liquid. This effect is caused by the surface tension of the liquid and the adhesive and cohesive forces acting at the liquid-solid interface.
Two practical illustrations of capillarity are:
$1$. The rise of oil in the wick of a lamp: The oil rises through the fine spaces between the threads of the wick due to capillary action,allowing it to reach the flame.
$2$. Absorption of ink by a blotting paper: The blotting paper contains a large number of fine pores which act as capillary tubes,drawing the ink into the paper through capillary action.
Two practical illustrations of capillarity are:
$1$. The rise of oil in the wick of a lamp: The oil rises through the fine spaces between the threads of the wick due to capillary action,allowing it to reach the flame.
$2$. Absorption of ink by a blotting paper: The blotting paper contains a large number of fine pores which act as capillary tubes,drawing the ink into the paper through capillary action.
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Two vertical parallel plates are partially submerged in water. The distance between the plates is equal to $d$. Water rises due to surface tension $T$,the width of the plates is $l$,and the contact angle of water with glass is $0^o$. Find the force of attraction between the plates.
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View SolutionLiquid $A$ rises to a height of $10 \ cm$ in a capillary tube and liquid $B$ falls to a depth of $2 \ cm$ in the same tube. The densities of $A$ and $B$ are $1 \ g/cm^3$ and $10 \ g/cm^3$ respectively. The contact angles of $A$ and $B$ with the tube are $0^{\circ}$ and $135^{\circ}$ respectively. If the surface tensions of $A$ and $B$ are $S_A$ and $S_B$, then the ratio $\frac{S_B}{S_A}$ is:
When a capillary tube is dipped into two liquids having relative densities $0.8$ and $0.6$ and surface tensions $60 \, dyne/cm$ and $50 \, dyne/cm$ respectively,the ratio of the heights of the liquids in the capillary tube $\frac{h_1}{h_2}$ is:
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View SolutionWater rises up to a height $h$ in a capillary tube on the surface of the earth. The value of $h$ will increase if the experimental setup is kept in:
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