Show P - V or T - V diagram and indicate corresponding state. 5. Answer the questions about the conditionsof the given phase change material.(1) In refrigerant R134a, calculate thetemperature and enthalpy h (kJ/kg) at apressure of 1 MPa and a specific volume of0.01474 m^ 3 /kg.(2) In refrigerant R134a, calculate thepressure and enthalpy (kJ/kg) at -20°C and aspecific volume of 0.1 m^ 3 /kg.(3) In a 0.1m^3 volume container, there iswater with a pressure of 1 MPa and atemperature of 250°C. Find the mass of water(kg).(4) At a pressure of 0.4 MPa, 2 kg of water iscontained in a 0.4 m^3 container. Find thetemperature in the container and the internalnegative energy (kj/kg).(5) A container with a volume of 3 m^3contains 5 kg of water with a pressure of 200kPa. Find the temperature and internalenergy (kJ/kg).

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(1) In refrigerant R134a, calculate the temperature and enthalpy h (kJ/kg) at a pressure of 1 MPa and a specific volume of 0.01474 m^ 3 /kg.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

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