Capillary Action Demonstration

These Capillary tubes are very thing glass tubes that have the ability to draw up liquid due to the adhesive forces between the glass and the liquid (food coloring) pulling the liquid up and the cohesive forces holding the water molecules together.

[dynamicadithya]

2Scosθ = ρghr

S = surface tension of the liquid
θ = contact angle of the liquid and tube
ρ = density of the liquid
g = acceleration due to gravity on the surface of Earth ( ~ 9.8 m/s )
h = level of rise of liquid in the capillary tube
r = radius of the tube.

Why did I even type this?

[Usercode-gwItHgd]

This happens on our food as well when dipped into sauce

[theyashb]

what are the dimensions of the glass tube

[tuichime]

i saw these tubes in fisheries laboratory

[spongebobsquarepantshindi]

Are you sucking the tube with mouth ??