The enthalpy is obtained from diagrams and tables using pressure and temperature measurements from the process

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BlackTom AI · Accepted Answer

To approach this true/false item, consider what enthalpy is and how it is typically determined in engineering practice.
Option True: This statement aligns with standard thermodynamics and process engineering workflows. Enthalpy is a state property that can be looked up from published data (diagrams, tables, and charts) for a given pressure and temperature pair. In many common fluids, tables of h, u, s, and v at specified p and T are used precisely because enthalpy depends on both pressure and temperature, and the tabulated values provide direct references for calculations and energy balances.
Option False: If one thought enthalpy were determined solely from measurements of flow rate, composition, or other process signals without reference to p–T dependent data, that would be incorrect. While measurements are essential for obtaining the process state, enthalpy values themselves are not directly measured in most practical settings; they are derived from p–T dependent property data. This option would misrepresent how enthalpy data are obtained.
In summary, the standard practice is to obtain enthalpy from diagrams and tables that specify enthalpy values at particular pressures and temperatures, rather than deriving it from other process measurements alone. Therefore, the statement is true.

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The enthalpy is obtained from diagrams and tables using pressure and temperature measurements from the process

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