Answer :
Capillary action causes a liquid to rise in a capillary tube if it wets the tube's surface, but if the tube is too short, the liquid may overflow.
When a capillary tube of insufficient length is dipped into a liquid that wets its surface, capillary action will cause the liquid to rise within the tube until the adhesive forces are balanced by the weight of the liquid. If the tube is too short, the liquid will continue to rise until it reaches the top of the tube, potentially overflowing if the adhesive forces are strong enough to draw up more liquid than the tube can contain.
The extent of the rise is determined by the balance of adhesive forces between the liquid molecules and the tube molecules against the cohesive forces within the liquid and is also influenced by the radius of the capillary tube and the contact angle.
