The process in which liquid or gas molecules adheres firmly to the surface of solid or liquid.

The taking up and holding of one substance by another. used especially as a general term for absorption and adsorption.

The process by which molecules intermingle as a result of their kinetic energy of random motion.

The process in which a liquid or gas molecules penetrate into the solid material.

The diffusion of solute from the region of low concentration to the region of high concentration through semi permeable membrane h

It is the measurement of the extent to which a material will dissolve in a given fluid. e.g. saliva or water.

The extent to which an adhesive can wet the surface of adherent can be determined by measuring the contact angle between the adhesive and the adherent.

If the molecules of adhesive are attracted more to the molecules of the surface, the adhesive will spread completely over the surface of the solid

Force of attraction between molecules of same substance.

Force of attraction between molecules of different substances

The process which combines the chemical process of dissolution with a mild mechanical action.

material that allow the flow of electrical current in one or more directions.

used to describe the destruction of natural hard tissue by acids (either occurring naturally or present in food/drinks)

The increase in energy per unit area

Interfacial tension that exists between the two surfaces due to unbalanced intermolecular forces. For adhesion to exist the surfaces must be attracted to one another at their interface

Interfacial tension between a liquid and a solid resulting in a contact angle of less than 90°.

Adhesion is negligible when the surface molecules of the two materials are separated by a distance greater than 0.7nm.

The extent to which an adhesive can wet the surface of adherent can be determined by measuring the contact angle between the adhesive and the adherent.

If the molecules of adhesive are attracted more to the molecules of the surface, the adhesive will spread completely over the surface of the solid

The materials that offer high resistance to the flow of electric current.

occurs when two electrochemically dissimilar metals are in contact and a conductive path occurs for electrons and ions to move from one metal to the other

The atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form.

energy required to change a gram of a substance from the solid to the liquid state at melting temperature.

energy required to change a gram of a liquid into the gaseous state at the boiling point

the measure of the ability of a material to allow the flow of heat.

Thermal conductivity of a substance divided by the product of its density and its specific heat capacity.

the amount of heat per unit mass required to raise the temperature by one degree Celsius.

Change in length per unit original length per degree rise in temperature

1) Colour 2) Hue 3) Value 4) Chroma 5) Transparency 6) Translucency 7) Opacity 8) Fluorescence

1) Viscosity 2) Creep & Flow 3) Viscoelasticity 4) Newtonian behavior 5) Pseudoplastic behavior 6) Thixotrophic behavior 7) Dilatant

Combined intensities of the wavelengths present in the beam of light

The property associated with colour of an object (i.e. Red, Green, Blue)

The amount of lightness or darkness of a colour is called value (i.e. from bright to dull)

Degree of saturation of a particular hue.

The property of a material that allows the passage of light in such a manner that the object may be clearly seen through.

The property of a material that permits passage of light but disperses the light so the object cannot be seen through.

The property of a material that prevents the passage of light.

The phenomenon of emission of light by a substance that has absorbed light or other electromagnetic radiations. It is an emission of light (photons) by a substance that has absorbed light of higher energy.

the science of flow and deformation of matter and describes the interrelation between force, deformation and time.

- It is the study of the manner in which materials respond to applied stress or strain.

Resistance of a liquid to flow dependent upon interatomic bonding. Water molecules has weak interatomic bonding thus flows easily as compared to oil/honey

defined as the time dependent plastic strain of a material under static load or constant stress.

implies a greater deformation produced more rapidly with a smaller applied stress. describes the rheology of the amorphous materials in dentistry

The behavior that is intermediate between viscous liquid and elastic solid. e.g. Elastomeric impression materials. The more rapidly the material is loaded or unloaded the more elastically the material will behave.

When shear strain rate is proportional to shear stress, the behavior is

when viscosity decreases with increase in shear rate.

when it exhibit a different viscosity after deformation.

Behavior seen in liquids that show higher viscosity with increase in shear rate