Lecture 1 Flashcards
can be defined as the science of
energy.
Thermodynamics
can be viewed as the ability to cause changes
Energy
most descriptive of the early efforts to convert heat into power
Thermodynamics
broadly interpreted to include all aspects of energy and
energy transformations including power generation,
refrigeration, and relationships among the properties of
matter
Thermodynamics
It simply states that during an interaction, energy can
change from one form to another but the total amount
of energy remains constant. That is, energy cannot be
created or destroyed
Conservation of Energy Principle
simply an expression
of the conservation of energy principle, and it asserts
that energy is a thermodynamic property.
first law of thermodynamics
asserts that energy
has quality as well as quantity, and actual processes
occur in the direction of decreasing quality of energy
second law of thermodynamics
study of thermodynamics
that does not require a knowledge of the behavior of
individual particles.
classical thermodynamics
based on the average
behavior of large groups of individual particles
statistical thermodynamics
characterized by any physical quantity can be
dimensions
The magnitudes assigned to
the dimensions
units
basic dimensions
such as mass m, length L, time
t, and temperature T
primary or fundamental
dimensions
expressed in terms of the
primary dimensions ex.
velocity, energy, volume
secondary dimensions or
derived dimensions
also
known as the United States
Customary System (USCS)
English system
(from Le Système International d’ Unités) also
known as the International system
metric SI
can simply be defined
as force times distance;
Work
defined as the energy
required to raise the temperature of 1 lbm of water at
68°F by 1°F.
Btu
(British thermal unit)
the amount of energy
needed to raise the temperature of 1 g of water at 14.5°C
by 1°C is defined as
1 calorie (cal)
unit for time rate of energy
joule per second (J/s) which is called watt (W)
every term in an equation must
have the same unit
Dimensional Homogeneity
defined as a
quantity of matter or a region in
space chosen for study.
System
The mass or region outside the
system
Surroundings
The real or imaginary surface that separates the system
from its surroundings
Boundary
The boundary of a system can be
Fixed or movable
contact surface shared by both the system and the surroundings. Mathematically
speaking, the blank has zero thickness, and thus it
can neither contain any mass nor occupy any volume in
space.
Boundary
consists of a fixed amount of
mass, and no mass can cross its
boundary
closed system (also known as a
control mass)
properly selected region in
space.
open system, or a control
volume
