2300_les07

2300_les07 - III. Evaluating Properties A. Definition of a...

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1 lesson 7 III. Evaluating Properties A. Definition of a Pure Substance 1. fixed chemical composition throughout 2. examples dry air (yes) root beer float (no) water and ice (yes) mix of gaseous and liquefied air (no) water and steam (yes) N 2 (yes) B. Phases of a Pure Substance 1. Solid, liquid, gas (for water we have ice, water, and steam) lesson 7 III. Evaluating Properties 2. Example of a process involving change of phase. Start with liquid water at 25 °C, 1 atm, in cylinder fitted with weightless, frictionless piston. Add heat until liquid completely vaporizes. heat addition 1 atm piston heat addition 1 atm piston heat addition 1 atm piston Initially 100% liquid at 25 C. This is called compressed liquid state. Saturated mixture of liquid and vapor at 100 C Superheated vapor at T > 100 C
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2 lesson 7 III. Evaluating Properties 2. Example of a process involving change of phase Plot of process on T-v diagram. The temperature does not change when two phases are present. T, °C v, m 3 /kg 100 25 P = 1 atm Saturated mixture Superheated vapor Compressed liquid lesson 7 III. Evaluating Properties C. The P-v-T Surface 1. a substance which contracts on freezing (Figure 3-26, p. 125).
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2300_les07 - III. Evaluating Properties A. Definition of a...

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