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Introduction
1. Définition.
3. Derived Units.
5. S.L Units (International System oj Units).
7. Kilogram.
9, Kelvin.
11. Rules for S.L Units.
13. Force.
15. Tkermodynamic Systems.
17. Stateof a System.
19- Absobite Température.
21. Equality of Température.
23. Gauge Pressure and Absobite Pressure.
25. Standard Température and Pressure.
27. 7ype of Stored Energy.
29. Sensible Heat
31. Spécifie Heat
33. Hb/fc
35. ComparUon of Heat and Work.
37. £aw o/ Thermodynamies.
39. laies o/ JVi/ecf Gas<rÎ.
41. JouU’sLaw.
43. Spécifie Heats ofa Cas.
45. Ratio of Spécifie Heats.
47. Tkermodynamic Processes.
49. Application of First Law of Tkermo~
dynamics to a Non-Jlow Process.
51. Tkermodynamic Cycle.
53. FtoM» Processes.
1.1 Définition
The term Refrigeration may bc defined as the process of lemoving heat from a substance under controlled conditions.
It also includes the process of reducing and maintaining the température of a body below the gênerai température of ils surroundings.
In othcr words, the réfrigération mcans a continued extraction of heat from a body whose température is already below the température of its surroundings. For example.
if some spacc (say in cold storage) is to be kept at – 2°C (273 K), we must continuously extract heat which flows into it duc to leakage through the walls

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