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Thermodynamics > Basic concepts > Flashcards

Basic concepts Flashcards

1
Q

1st Law of Thermodynamics

A

Conservation of energy

Energy cannot be created nor destroyed

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2
Q

2nd Law of Thermodynamics

A

Heat/energy moves from a source of high concentration to a source of cold concentration

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3
Q

Classical Thermodynamics

A

Macroscopic approach

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4
Q

Statistical Thermodynamics

A

Microscopic approach

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5
Q

Fundamental Dynamics

A

Mass

Length

Time

Temperature

Electrical current

Amount of light

Amount of matter

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6
Q

Secondary/derived dimensions

A

Velocity

Energy

Volume

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7
Q

Unity Conversion Ratio

A

(N ) / (kg * (m/s^2)) = 1

1 lbf) / (32.174 lbm * (ft/s^2)

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8
Q

System

A

Quantity of matter or a region in space chosen for study

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9
Q

Closed System

A

Heat and work interaction

Mass is constant

Energy can enter and leave the system

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10
Q

Open System

A

Mass is changing

Volume is constant

Involves heat, work, and mass interaction

Energy can enter and leave the system

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11
Q

Specific Volume

A

v = V / m

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12
Q

Specific Total Energy

A

e=E / m

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13
Q

Specific gravity

Relative density

A

SG = density / density of h20 at 4degrees Celcius

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14
Q

Properties of a system

A

Pressure

Temperature

Volume

Mass

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15
Q

Intensive Properties

A

Independent of the mass of a system

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16
Q

Extensive Properties

A

Dependent on the mass of a system

17
Q

State of a system

A

Described by a set of properties

18
Q

Equilibrium

A

State of balance

19
Q

Thermal Equilibrium

A

Temperature is the same throughout the system

Practically speaking, not possible to reach complete thermal equilibrium

20
Q

Mechanical Equilibrium

A

No change in pressure

21
Q

Chemical Equilibrium

A

No chemical reactions

22
Q

Phase Equilibrium

A

Entire phase of the system is the same

Gas=gas
Liquid = liquid

23
Q

State Postulate

A

The state of a simple compressible system is completely specified by two independent intensive properties.

24
Q

Simple Compressible System

A

Absence of electrical, magnetic, gravitational, motion, and surface tension effect

25
Q

Quasi-state process

Quasi-equilibrium process

A

System remains infinitesimally close to an equilibrium state at all times

26
Q

Pgage

A

Pgage = Pabs- Patm

27
Q

Pvac

A

Pvac = Patm - Pabs

28
Q

Thermodynamics

A

Science of energy

Thermodynamics (1 decks)

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