critical temperature


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.
Related to critical temperature: critical volume, triple point

critical temperature

[′krid·ə·kəl ′tem·prə·chər]
(agriculture)
The temperature below which a plant cannot grow.
(physical chemistry)
The temperature of the liquid-vapor critical point, that is, the temperature above which the substance has no liquid-vapor transition. Symbolized Tc.

Critical Temperature

 

(1) The temperature of a substance in its critical state. For single substances the critical temperature is defined as the temperature at which the physical properties of the liquid and the vapor in equilibrium become identical. At the critical temperature the density of the saturated vapor and the liquid become identical, the interface between them disappears, and the heat of vaporization becomes zero. The critical temperature is one of the constants of a substance. (For the value of the critical temperature Tc for some substances, see.)

In binary systems (for example, propane-isopentane) the fluid-vapor equilibrium has no single critical temperature but rather a spatial critical curve for which the terminal points are the critical temperatures of the pure components.

(2) The temperature in fluid mixtures having components of limited solubility at which the mutual solubility becomes unlimited; it is called the critical solution temperature.

(3) The transition temperature of a number of conductors into the superconducting state. It has been measured for a large number of metals, alloys, and chemical compounds. In pure metals the lowest critical temperature occurs in titanium (0.37°K) and the highest in technetium (11.2°K). A very high value has been found in the compound Nb3Ge (Tc ≈ 23°K).

critical temperature

1. The temperature at which a steel structure cannot carry the service load for which it was designed because of softening of the steel that occurs when it is heated significantly.

critical temperature

i. The temperature inside the cylinder of a reciprocating engine that will cause the fuel to explode rather than burn evenly when it is ignited.
ii. The temperature at which the internal structure of a metal takes on a crystalline form.
References in periodicals archive ?
Because material was by then in short supply, critical temperatures were not determined by the multi-specimen procedure specified in ISO 13477.
Caption: FIGURE 3 GWP of fluids versus critical temperature and flammability.
179 Table 3 Effect of gradient temperature on critical temperature parameter of plates with different modulus ratio (a / b = 1; a / h = 10; n = 8; [K.
St], a value of the critical temperature in the bearing (the temperature that maintains the viscosity constant) of about 38[degrees]C is obtained.
We have also discussed the two primary results of RCP testing--the critical pressure and the critical temperature.
It also shows that the critical temperatures of phlogopite were 850, 950, 1000, 1050, 1100, and 1150[degrees]C.
Proceeding from results of investigations of dependence of the carbon coating condensation factor upon the molybdenum substrate temperature, critical temperature [T.
In the new experiment, described in the March 16 Science, physicists at the Swiss Federal Institute of Technology in Zurich and the University of Cambridge in England magnetically confined a Bose-Einstein condensate of rubidium atoms and let it spontaneously warm, crossing the critical temperature in reverse.
Based on proprietary technology, a new 384-hole heater is available to provide critical temperature uniformity across a 384well polymerase chain reaction (PCR) sample block.
The 384-hole heater provides critical temperature uniformity across a 384 well polymerase chain reaction (PCR) sample block.
He added: "On the trolley was acetylene cylinder which reached a critical temperature.
A graph of the data over the temperature showed a sharp drop in the magnetic field once the critical temperature of the superconductor was reached.

Full browser ?