Tavola periodica degli elementi
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C

Glossary
Celsius scale | Charles' law | Critical temperature

Celsius scale
The zero point on Celsius scale is the melting point of water (0 °C = 273.15 K). The size of one degree on Celsius scale (°C) is same as on the Kelvin scale (K). Conversion between Celsius and Kelvin is achieved using the following relationship

T K = T °C + 273.15

Charles' law
According to Charles' the volume of a gas is directly proportional to its temperature at constant pressure. But this law is only empirical and exact only for ideal gases.
 p1  =    T1
 p2   T2
or
 pt = po × (1 +   t   ) 
 273 

Critical temperature
Critical temperature is the point on the phase diagram of a two-phase system at which the two coexisting phases have identical properties and therefore represent a single phase. It is not possible to liquefy any substance above its critical temperature.

 

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Last modified: 01.02.2002
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