About the Control Volume

Rudimentary ideas prior to the perspective "Control Volume" are:

  • Matter exists in space and time. There is change. Matter experiences events in accord with natural physics.
  • Physical behaviors of matter are known in terms of values of their physical properties.

Clear, concise ideas are important. When ststed as mathatical formulations, ideas sharpen, descriptions of physical reality and change become more precise. But not always!

The idea "Control Volume" remains in our texts, a carry-over of many, many over-priced editions. The motive of "control volume" is the human persp[ective of observation.

Terminology is also important. Also I think the "0" of the equations deserves some respect. Left of equality, right, between equalities... the "0" is not an arithmetic nothing. Zero is the mass in the space which sometimes is space only, the mass having the scalar magnitude - zero. The space is still there - the "control volume."

Behaviors of matter in space and time are in accord with material conditions and changes of that matter itself. Matter moves "materially" meaning "as it is physically motivated." Matter has no innate perspective of its events. Matter exists in its "material space."

Humans, observers of reality, are nosey about events and change of matter. Beyond just nosey, humans fanaticize about reality, dream that their mathematics might tell...

For humans observation "material change of matter is complex. Two vantages of observation arrive from human biology envision of observation perspectives of physical reality are "material" or "spatial." These two perspectives are...

Basic Thermodynamics ~ J. Pohl © www.THERMOspokenhere.com

Control Volume - Controls What?

Clear concise ideas are important. Math notation sharpens description; let's use it.

Also I think the "0" of the equations deserves some respect. Left of equality, right, between equalities... the "0" is not an arithmetic nothing. Zero is the mass in the space which sometimes is space only, the mass having the scalar magnitude - zero. The space is still there - the "control volume."

Behaviors of matter in space and time are in accord with material conditions and changes of that matter itself. Matter moves "materially" meaning "as it is physically motivated." Matter has no innate perspective of its events. Matter exists in its "material space."

Humans, observers of reality, are nosey about events and change of matter. Beyond just nosey, humans fanaticize about reality, dream that their mathematics might tell...

For humans observation "material change of matter is complex. Two vantages of observation arrive from human biology envision of observation perspectives of physical reality are "material" or "spatial." These two perspectives are...