By Michael A. Boles, Yunus A. Cengel
An undergraduate textual content in thermodynamics.
Excerpt from history:
Thermodynamics is an exhilarating and engaging topic that bargains with power, that is crucial for sustenance of lifestyles, and thermodynamics has lengthy been an important a part of engineering curricula around the world. It has a extensive software zone starting from microscopic organisms to universal loved ones home equipment, transportation automobiles, strength iteration structures, or even philosophy. This introductory e-book includes enough fabric for 2 sequential classes in thermodynamics. scholars are assumed to have an enough heritage in calculus and physics.
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Extra resources for Thermodynamics: An Engineering Approach (5th Edition)
FIGURE 1–13 A mass of 1 lbm weighs 1 lbf on earth. qxd 10 | 4/25/05 2:29 PM Page 10 Thermodynamics Analysis We apply Newton’s second law to calculate the weight (force) that corresponds to the known mass and acceleration. The weight of any object is equal to its mass times the local value of gravitational acceleration. 174 lbm # ft>s2 Discussion Mass is the same regardless of its location. However, on some other planet with a different value of gravitational acceleration, the weight of 1 lbm would differ from that calculated here.
1868 J. 0551 kJ). 103 | 7 FIGURE 1–9 A body weighing 150 lbf on earth will weigh only 25 lbf on the moon. 174 lbm · ft/s2 = 1 lbf FIGURE 1–10 The weight of a unit mass at sea level. qxd 8 | 3/31/05 3:38 PM Page 8 Thermodynamics Dimensional Homogeneity We all know from grade school that apples and oranges do not add. But we somehow manage to do it (by mistake, of course). In engineering, all equations must be dimensionally homogeneous. That is, every term in an equation must have the same unit (Fig.
Raising the temperature of a substance by 10°C is the same as raising it by 10 K. 8°F (1–13) (1–14) Some thermodynamic relations involve the temperature T and often the question arises of whether it is in K or °C. If the relation involves temperature differences (such as a ϭ b⌬T), it makes no difference and either can be used. However, if the relation involves temperatures only instead of temperature differences (such as a ϭ bT) then K must be used. When in doubt, it is always safe to use K because there are virtually no situations in which the use of K is incorrect, but there are many thermodynamic relations that will yield an erroneous result if °C is used.