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ME 2334 Thermodynamics important things to know Louisiana State University
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ME 2334 Thermodynamics important things to know Louisiana State University
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ME 2334 Thermodynamics important things toknow Louisiana State University
, ME 2334 Thermodynamics important things to know Louisiana State University
conservation of energy principle - --energy cannot be created nor destroyed but it can be transformed
from one form to another if total energy remains constant.
first law of thermodynamics - --energy conservation principle
second law of thermodynamics - --energy is described by quantity and quality
processes occur in the direction of decreasing quality of energy
classical thermodynamics - --macroscopic approach to studying thermodynamics that does not require
knowledge of the behavior of the molecules
ex) examining air's properties (density, P, and T)
molecular/statistical thermodynamics - --microscopic approach to studying thermodynamics
focuses on the behavior of molecules
ex) examining the molecular makeup of air
units of force - --1 N → force required to accelerate a mass of 1 kg at a rate of 1 m/s²
1 lbf
units of work/energy - --1 J → the work done by a force of 1 N actioning of a distance of 1 m (1 N* 1 m)
1 calorie (English)
1 Btu =
power (P) - --1 W → 1 J of work done in 1 s
how fast or slow energy is produced/work being done
, as power ↑, work ↑ or time↓
1 hp
system - --a system is defined as a quantity of matter or a region in space chosen for a study. it is
contained by a boundary
surroundings - --the mass/region outside of the system/boundary
boundary - --the surface that separates the system from the surroundings
zero thickness, mass, and volume
can be moving (balloon), or flexible, or fixed
closed system with a fixed boundary - --there is no mass exchange, but energy change can still occur.
volume is fixed, energy is not necessarily fixed. the mass is controlled
closed system with a moving boundary - --there is no mass exchange, but energy change can still occur.
volume is changing, energy is not necessarily fixed. the mass is controlled
open system - --can have both mass and energy exchange. the volume is controlled.
property - --any characteristic of a system
ex) pressure, temperature, and density
extensive property - --dependent on the mass of the system
ex) mass, volume, and energy
can be converted into an intensive property by dividing by mass. these properties are known as specific
properties. changes when a system is divided into 2
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