## What is critical temp and pressure?

For a pure substance, the critical pressure is defined as the pressure above which liquid and gas cannot coexist at any temperature. The critical temperature for a pure substance is the temperature above which the gas cannot become liquid, regardless of the applied pressure.

**What is the critical pressure of steam in bar?**

Critical pressure and temperature of water are 220 bar and 373.14 °C, as steam water is a valuable heating agent below 200 °C, where the saturation pressure is about 24 bar.

### What is R for steam?

Ideal Gas Constant of Steam: R = 0.4615 kJ/kg.K.

**What is the formula for critical temperature?**

Solution: TC = 647 K, PC = 22.09 Mpa = 22.09 × 103 kPa, VC = 0.0566 dm3 mol-1. Therefore, Van der Waals constant, b = VC/3 = (0.0566 dm3 mol-1)/3 = 0.0189 dm3 mol-1. From the critical constants formula of real gas, a = 3 PC VC2 = 3 (22.09 × 103) × (0.0566)2 = 213.3 kPa mol-2.

## How do you find critical temperature?

Microscopic view of a liquid. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied. Every substance has a critical temperature….

substance | critical temperature (oC) |
---|---|

NH3 | 132 |

O2 | -119 |

CO2 | 31.2 |

H2O | 374 |

**What is critical pressure ratio of steam nozzle?**

The ratio of the pressure at the section where sonic velocity is attained to the inlet pressure of a nozzle is called the critical pressure ratio. It happens at Mach number equals 1.

### What is steam k?

Steam Cp=1.8723 kJ/kg. K Cv=1.4108 kJ/kg.

**What is Argon CV?**

Properties of Various Ideal Gases (at 300 K)

Gas | Formula | Specific Heat at Const. Vol. |
---|---|---|

Cv[kJ/kg.K] | ||

Air | — | 0.718 |

Argon | Ar | 0.3122 |

Butane | C4H10 | 1.5734 |