Jurin's law
Capillary rise or fall in a tube.
Jurin's law describes the rise and fall of a liquid within a thin capillary tube. Named after its discoverer James Jurin.
This law is expressed as:
where
- h is the liquid height ;
- γ is the liquid surface tension ;
- θ is the contact angle of the liquid on the tube wall ;
- ρ is the liquid density ;
- r is the tube radius ;
- g is the gravitational acceleration.
This law is valid if the tube radius is smaller than the capillary length.