It occurs when mercury is placed in a glass capillary.
The types of meniscus are shown in the figure.
In a convex meniscus, the angle of contact is greater than \(90^{\circ},\) which is angle between tangent to the liquid surface and the capillary surface, inside the liquid.
[પાણીનું પૃષ્ઠતાણ ${T}=7.3 \times 10^{-2} \, {Nm}^{-1}$, સંપર્કકોણ $=0, {g}=10\, {ms}^{-2}$ અને પાણીની ઘનતા $\left.=1.0 \times 10^{3} \,{kg} \,{m}^{-3}\right]$