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OAT Physics
Chapter 4 - Thermodynamics
| Term | Definition |
|---|---|
| Thermodynamics | study of heat and its effects |
| 1st Law of Thermo | conservation of E during heat transfer; E = Q - W |
| Thermal Expansion | increase in length by a solid due to temp increase; change in L = alpha L change in T |
| Volume Expansion | expansion of a liquid when heated; change in V = beta V change in T |
| Heat | E transfer btwn two objects as a result of a diff in temperature |
| Conduction | direct transfer of E from molecule to molecule thru collisions |
| Convection | heat transfer thru mass motion of heated materials; only liquids and gases |
| Radiation | transfer of heat via electromagnetic waves |
| Conversion of heat units | 1 kcal = 1 Cal = 4184 J |
| heat equation | Q = mc change in T; only if phase of object stays the same |
| Heat of Transformation | Q = mL where L is the heat of transformation |
| heat of vaporization | liquid to gas and vice versa |
| heat of fusion | solid to liquid and vice versa |
| Pressure | = F/A |
| 1 atm = | 760 torr, 1.013E5 Pa |
| Work done by the system | increases V; positive Work |
| Word done on the system | decreases V; negative Work |
| Net Work done by a gas | = work done by system - work done on system |
| Constant Pressure | isobaric |
| Adiabatic (constant T) | Q = 0 |
| Constant V | W = 0 |
| Closed | Q = W |
| Entropy | measure of disorder; a system can either increase (irreversible) or remain the same (reversible processes) in this |
| Entropy Eq | change in S = Q/T; no mass needed and change in phase means T is constant |
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