Question

What is reduced pressure in thermodynamics?

Answer 1

1. At a critical point, the fluid's state properties are normalized, due to state variables.
2. These are the reduced properties.
3. These reduced properties help in determining the behavior of a substance near its critical point.
4. Near the continuous phase transition the behavior of physical quantities can be understood with the help of critical components.
5. Therefore, reduced pressure is the unit less quantity.
6. The ratio of actual pressure to critical pressure is called reduced pressure in the thermodynamics system.
7. Mathematically it can be represented as follows:
   ${\mathrm{P}}_{\mathrm{r}}=\frac{{\mathrm{P}}_{\mathrm{a}}}{{\mathrm{P}}_{\mathrm{c}}}$; where ${\mathrm{P}}_{\mathrm{r}}$ stands for reduced pressure, ${\mathrm{P}}_{\mathrm{a}}\mathrm{and}{\mathrm{P}}_{\mathrm{c}}$are the actual and critical pressure respectively.