Freezing

Referred to in physics solidify the transition of a substance from a liquid to solid state. In most cases this is done by cooling. The reverse process of solidification is melting.

For pure substances and constant pressure the solidification always occurs at a certain temperature, the freezing point is called ( line solidification ). It corresponds exactly to the melting point of pure substances. Although the material gives off heat on solidification ( solidification heat ), the temperature remains during the transition from liquid to solid is constant ( latent heat). During solidification occurs in many substances for the crystallization, wherein the Brownian movement of the molecules is reduced. Therefore, the molecules have solidified in a lower energy state than in the liquid, which is equivalent to an energy tax.

Water and other aqueous solutions freeze when they pass into the solid state. Freezing is called by freezing colloquially food preservation.

Building Materials

From the perspective of Materials Science solidification of the cement paste in concrete or mortar called the defined viscosity increase due to water retention (storage of water of crystallization). This process is also called hydration. Prior to solidification, the stiffening occurs that is completed after at least an hour. After solidification ( period 12 hours) the hardening of the building material starts. By means of special concrete admixtures can accelerate the solidification on demand or be delayed.

More word meanings

In geology solidification also means the solidification of volcanic rock, when this cools ( igneous rock ).

Colloquially and in zoology means freezing or startle Rigid (English: freezing ) that an organism (human, animal, etc. ) suddenly in response to a disturbance or other stimulus is motionless.

• Thermodynamic process
• Building Materials