Question

How are the reduced pressure and reduced temperature defined?

Short answer

Answer: Reduced pressure and reduced temperature are dimensionless quantities that allow us to compare different fluids based on their critical properties. Reduced pressure (Pr) is the ratio of the actual pressure (P) of a fluid to its critical pressure (Pc), and is calculated using the formula Pr = P/Pc. Reduced temperature (Tr) is the ratio of the actual temperature (T) of a fluid to its critical temperature (Tc), and is calculated using the formula Tr = T/Tc. To calculate these values, we need to know the critical pressure and temperature of the fluid and the actual pressure and temperature of the fluid.

Step-by-step solution

Definition of Reduced Pressure

The reduced pressure (Pr) is the ratio of the actual pressure (P) of a fluid to its critical pressure (Pc). It is a dimensionless quantity and is used to compare fluids at different pressures relative to their critical points. The formula to calculate reduced pressure is: Pr = \frac{P}{Pc}

Definition of Reduced Temperature

The reduced temperature (Tr) is the ratio of the actual temperature (T) of a fluid to its critical temperature (Tc). It is also a dimensionless quantity and is used to compare fluids at different temperatures relative to their critical points. The formula to calculate reduced temperature is: Tr = \frac{T}{Tc} To calculate reduced pressure and reduced temperature, we need to know the critical pressure and critical temperature of the fluid, which can be found in reference books or scientific databases, and the actual pressure and temperature of the fluid.