Definitions

Question 1

Closed System

Answer 1

No mass can cross boundary but energy can cross via work and heat transfer.

Question 2

Open System

Answer 2

Mass and energy can cross boundary

Question 3

Isolated system

Answer 3

No mass or energy can cross boundary. No influence by surroundings on system

Question 4

Intensive property

Answer 4

Independent of mass of system. e.g: Pressure, Velocity, Temperature, Density

Question 5

Extensive property

Answer 5

Changes if system is halved. Eg :Volume, Mass, Momentum

Question 6

Equilibrium

Answer 6

All substances have the same properties.

Question 7

Steady State

Answer 7

No properties in a certain position in a system change with time.

Question 8

Isobaric

Answer 8

Constant pressure process

Question 9

Isochoric

Answer 9

Constant volume process

Question 10

Isothermic

Answer 10

Constant temperature process

Question 11

Zeroth law of thermodynamics

Answer 11

When two bodies have equality of temperature with a third body, they in turn have equality of temperature with each other.

Question 12

Absolute pressure

Answer 12

Pressure relative to a vacuum, always positive

Question 13

Atmospheric pressure

Answer 13

101 Kapaa, or 1 bar

Question 14

Gage Pressure

Answer 14

Pressure relative to atmospheric pressure, can be positive or negative

Question 15

Specific volume

Answer 15

The inverse of density

Question 16

Pure Substance

Answer 16

Homogenous/ same chemical composition no matter what phase

Question 17

Phase

Answer 17

Solid, liquid or Gas

Question 18

State of a system

Answer 18

Defined when two independent intensive properties are know. If we know P and v we can determine T

Question 19

Compressed liquid

Answer 19

Temperature and Pressure are independent

Question 20

Gas or Superheated Vapor

Answer 20

Temperature and Pressure are independent

Question 21

Mixed phase (liquid + vapor) (saturated region)

Answer 21

Pressure and Temperature are not independent

Question 22

Thermal energy Reservoir

Answer 22

Heat source or sink with large thermal capacity

Question 23

Heat engine

Answer 23

Converts heat to work

Question 24

Kevin-Planck Statement

Answer 24

No heat engine can have a thermal efficiency of 100%

Question 25

Clausius Statement

Answer 25

Refrigerator can’t operate without being plugged in

Question 26

Carnot hear engine

Answer 26

The efficiency of an irreversible heat engine is always less than the efficiency off a Carnot heat engine operating between the same temp. Reservoirs

Question 27

Adiabatic Process

Answer 27

A process occurring without heat transfer

Can involve work