Preferred Label : contact angle;
IUPAC definition : When a liquid does not spread on a substrate (usually a solid), a contact angle (θ)
is formed which is defined as the angle between two of the interfaces at the three-phase
line of contact. It must always be stated which interfaces are used to define θ. It
is often necessary to distinguish between the 'advancing contact angle' θ a, the 'receding
contact angle' θ r and the 'equilibrium contact angle' θ e. When θ r θ a the system
is said to exhibit contact angle hysteresis;
Origin ID : C01290;
See also
When a liquid does not spread on a substrate (usually a solid), a contact angle (θ)
is formed which is defined as the angle between two of the interfaces at the three-phase
line of contact. It must always be stated which interfaces are used to define θ. It
is often necessary to distinguish between the 'advancing contact angle' θ a, the 'receding
contact angle' θ r and the 'equilibrium contact angle' θ e. When θ r θ a the system
is said to exhibit contact angle hysteresis
