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Lecture gp111 07

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GP111 Elementary Thermodynamics Zeroth law of thermodynamics 1 Zeroth law of thermodynamics (formulated by R.H. Flower 1931) 0th low of thermodynamics is states that if two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. Another way, if two bodies have equality of temperature with a third body, they in turn have equality of temperature with each other. Another way, the 0th low of thermodynamics can be re-stated as, as two bodies are in thermal equilibrium if both have the same temperature reading even if they are not in contact. 2 0th low of thermodynamics Body 1 Thermal equilibrium Thermal equilibrium Body 3 Thermal equilibrium Body 2 3 0th law of thermodynamics Body 1 150°C Body 1 90°C Body 2 90°C Body 2 50°C Isolated enclosure 4 This allows the design & the use of Thermometers! 5 Temperature scales • Temperature scales enable us to use a common basis for temperature measurements. • Several temperature scales have been introduced throughout history, such as Celsius, Fahrenheit, Kelvin, Rankine scale, etc. • All temperature scales are based on easily reproducible states such as freezing (ice point) and boiling points (steam point) of water. 6 Celsius scale • Celsius temperature scale (previously known as the centigrade scale). The degree Celsius (symbol: °C) can refer to a specific temperature on the Celsius scale as well as serve as unit increment to indicate a temperature in ...
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