### condition | tension:

Surface tension
* Most surface tension arises from interaction
  - strong interaction
* arises from hydrogen bonding between water molecules
* becomes zero, and the boundary between liquid and gas vanishes.
* causes a free liquid to assume a spherical shape
  - an interesting phenomenon in soils
  - epoxy film to pull away from pinhole before it gels
  - interfaces to resist stretching
  - liquids to act like a thin, elastic film
* causes the lung to collapse
  - resulting gas bubble to be completely spherical
* causes water to clump in drops rather than spreading out in a thin layer
  - form spherical drops
* constrains active chemistry to predefined locations.
* creates the sheet of water between the flow and the hand.
* determines the pressure inside of a bubble.
* disinfectants Disinfectants are usually solutions of low surface tension.
* drives waves shorter in wavelength than a few centimeters.
* force that is always present in liquid phe- nomena.
* forms plano-convex microlenses.
* has the dimension of force per unit length , or of energy per unit area.
* helps to explain why the feathers of a duck can help the duck float on water.
* holds the water once it has been absorbed.
* is caused by the unevenness of attractive forces at the surface of a liquid
  - directly the force divided by the perimeter of the plate
  - displayed in the beads of water that form on the outside of a cold glass
  - essential for the transfer of energy from wind to water to create waves
  - implemented as a body force which acts in partially-filled cells
  - important for mixing substances
  - one of water's most important properties
* is responsible for the destabilization of many colloidal systems
  - shape of liquid droplets
  - spherical shape of a bubble
  - sort of like a thin invisible skin on the surface of water
  - temperature dependent
  - the energy needed to increase a surface area by a certain amount
* is the energy required to expand the surface area of a liquid by a unit amount
  - increase the surface area of a liquid by a unit amount
* is the force that is making the drop more or less half-hemispherical
  - keeps water molecules together
  - separates a liquid from the air
* is the measure of attraction between the surface molecules of a liquid
  - how difficult it is to stretch or break the surface of a liquid
  - property of a liquid's surface that, like a skin, holds it together
  - tendency of the surface of a liquid to behave as though covered with a skin
  - what allows some things to float on water even if they're denser than water
* keeps the fluid in contact with the solid
  - sides of a small burrow from collapsing
* measure of the tension between water molecules.
* physical phenomenon
* plays a big part in fisheyeing
  - an important role in the way liquids behave
* tends to draw liquids into spherical shapes.
+ Surface tension, Causes: Basic physics ideas‏‎ :: Fluid mechanics
  * Surface tension prevents the paper clip from submerging.
  * Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be perfectly spherical.

### condition | thirst:

Extreme thirst
* occurs but spasms in the larynx prohibit the animal to swallow fluids.
* results from frequent urination.