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Lecture 2, First Law 1-9-08

# Lecture 2, First Law 1-9-08 - Thermodynamics Simplifies...

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Thermodynamics Simplifies Energy There are only three types Potential Kinetic Internal Energy (E) Work (w) Heat (q) Work : Force (F) moves mass (m) over a distance (d) w = (F)(d) dimensions are joule = kg m 2 /s 2 Heat : Energy transferred between two masses that are at different temperatures q = C Δ T (calories) Heat and work appear only during energy transfers. When there is no transfer, only Internal Energy is recognized.

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Getting Started with Thermo Identity a process in which a change of some sort occurs – energy is transferred Usually, thermodynamics does not address absolute values of energy – changes are emphasized. Next, define a system where attention will be focused on an energy change and the surroundings with which the system interacts.
System, Surroundings and Universe System - The object or substance undergoing a change of physical state or reaction. What we are studying. Surroundings - Everything around the system that can exchange energy and mass with the system. Universe – everything! – System plus Surroundings

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Three Types of Systems 1. Open system can exchange mass and energy (usually in the form of heat) with the surroundings. 2. Closed system can exchange energy but not mass. 3. Isolated system – no transfer of energy or mass to the surroundings. All changes occur within the system.
A Thermodynamic Process Heat and/or work transferred between a system and its surroundings.

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Lecture 2, First Law 1-9-08 - Thermodynamics Simplifies...

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