Thermodynamics Chapter 1 True/False
temperature is an extensive property
false; temperature does not depend on the size of the system and therefore is intensive
according to Archimedes' principle, the magnitude of the buoyant force acting on a submerged body is equal to the weight of the body
false; the buoyant force has a magnitude equal to the weight of the displaced liquid
systems can be studied only from a macroscopic point of view
false; thermodynamics focuses a system microscopically
a closed system always contains the same matter; there is no transfer of matter across its boundary
true
body organs, such as the human heart, whose shapes change as they perform their normal functions can be studied as control volumes
true
both the Kelvin scale and the Rankine scale are absolute temperature scales
true
devices that measure pressure include barometers, Bourdon tube gages, and manometers
true
gage pressure indicates the difference between the absolute pressure of a system and the absolute pressure of the atmosphere existing outside the measuring device
true
if a system is isolated from its surroundings and no changes occur in its observable properties, the system was in equilibrium at the moment it was isolated
true
if the value of any property of a system changes with time, that system cannot be at steady state
true
in local surroundings at standard atmospheric pressure, a gage will indicate a pressure of 0.2 atm for a refrigerant whose absolute pressure is 1.2 atm
true
intensive properties may be functions of both position and time, whereas extensive properties can vary only with time
true
pressure is an intensive property
true
specific volume, the volume per unit of mass, is an intensive property whereas volume and mass are extensive properties
true
temperature is the property that is the same for each of two systems when they are in thermal equilibrium
true
the Rankine degree is a smaller temperature unit than the Kelvin degree
true
the kilogram for mass and the meter for length are examples of SI base units defined relative to fabricated objects
true
the pressure unit psia indicates an absolute pressure expressed in pounds force per square inch
true
the specific volume is the reciprocal of the density
true
the value of a temperature expressed using the Rankine scale is always higher than its value expressed using the Fahrenheit temperature scale
true
the volume of a closed system can change
true
volume is an extensive property
true
when a closed system undergoes a process between two specified states, the change in temperature between the end states is independent of details of the process
true
the value of the temperature expressed using the Celsius temperature scale is always higher than its value expressed using the Kelvin scale
false; a value expressed using the Kelvin scale is always 273.15 degrees higher than its value expressed using the Celsius scale
the composition of a closed system cannot change
false; combustion is an example of when the composition of the system changes as the initial combustible mixture becomes products of combustion
a control volume is a special type of closed system that does not interact in any way with its surroundings
false; control volume, also known as open system, involves mass flow across the boundary of the system
kilogram, second, foot, and newton are all examples of SI units
false; foot, a measure of length, is an example of an English unit; meter is an example of a unit of length which is SI
the pound force, lbf, is equal to the pound mass, lb
false; lbf is a unit of force and lb is a unit of mass
mass is an intensive property
false; mass depends on the size of the system and therefore is extensive
