Chapter 2 SOME CONCEPTS AND DEFINITIONS. Experimental observations have evolved into a set of laws that form the basis of the science of Thermodynamics:

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Presentation transcript:

Chapter 2 SOME CONCEPTS AND DEFINITIONS

Experimental observations have evolved into a set of laws that form the basis of the science of Thermodynamics: 0 th law (temperature) 1 st law (energy) 2 nd law (entropy) 3 rd law (absolute entropy)

Applications of these laws requires the use of mathematical models which, in turn, contain variables that describe the “state” of the system. We call these “state variables” the properties of the thermodynamic system: temperature pressure mass density, or specific volume enthalpy entropy

Energy

Specific Volume and Density

Pressure

Temperature A sense of hotness or coldness at the touch. Not very satisfying! Equality of temperature. Zeroth law of thermodynamics

Temperature Scales Celcius triple point of water steam point Kelvin (absolute scale) Fahrenheit Rankine

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