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Open systems. A closed system is defined when a fixed volume is under study. There can be mass transfers as well as energy transfers across the boundary.
Thermodynamic Systems
TYPE (Example)
Isolated (The Universe) No energy and no matter may be passed through the boundaries
Closed (A free Pinball Machine) Energy can pass through the boundaries, but matter cannot pass through the boundaries.
Adiabatic (A perfect Thermos) No heat (and therefore no matter that can carry heat) can pass through the boundaries.
Open (An Aquarium) Both energy and matter may be passed through the boundaries
Mary Rose
Open systems. A closed system is defined when a fixed volume is under study. There can be mass transfers as well as energy transfers across the boundary.
What do you suppose they meant to say? Just change "closed" to "open"? Is an open system defined when a fixed volume is under study?
Open systems Open systems can exchange both matter and energy with an outside system. They are portions of larger systems and in intimate contact with the larger system. Your body is an open system.
Closed systems Closed systems exchange energy but not matter with an outside system. Though they are typically portions of larger systems, they are not in complete contact.
Isolated systems Isolated systems can exchange neither energy nor matter with an outside system. While they may be portions of larger systems, they do not communicate with the outside in any way. The physical universe is an isolated system; a closed thermos bottle is essentially an isolated system (though its insulation is not perfect).
Mary Rose
Closed systems: A closed system is defined when a particular quantity of matter is under study. A closed system always contains the same matter. There can be no mass transfers across the boundary.
I suspect that that system is probably not well-understood, because I don't think that mass is well-understood.
Mary Rose
reply to post by boncho
If the observations that were made in the original experiments turn out to be incomplete or not quite accurate, the math associated with them will be wrong.
What's important is the experimentation, interpretation, and accurate theory upon which to base the math.
*
are strongly supported by empirical evidence - they are scientific knowledge that experiments have repeatedly verified (and never falsified). Their accuracy does not change when new theories are worked out, but rather the scope of application, since the equation (if any) representing the law does not change. As with other scientific knowledge, they do not have absolute certainty like mathematical theorems or identities, and it is always possible for a law to be overturned by future observations.
boncho
Actually no, math and theory is used to describe something and backed by empirical evidence.
Mary Rose
boncho
Actually no, math and theory is used to describe something and backed by empirical evidence.
If the empirical evidence has been falsely arrived at because the experimentation was misinterpreted, the math and theory will be wrong.
Mary Rose
If the empirical evidence has been falsely arrived at because the experimentation was misinterpreted, the math and theory will be wrong.
What We Mostly Pay the Power Company To Do
Essentially we pay the power company to engage in a giant Sumo wrestling match inside its generators and to lose by killing the free extraction of energy from the vacuum faster than the wrestling process powers the loads.
We pay the power company to use only a "single pass" of the energy flow along its transmission lines and the consumer power circuits, and thereby to just "waste" some 1013 times as much available EM energy as the company allows us to "use".
Present electrical power systems simply repeat this travesty over and over, so that we are continually inputting external energy to the generator to restore the source dipole, and having to input more than we get back out as work in the load. That is why all conventional EM power systems exhibit COP < 1.0 a priori. The system is specifically designed to force itself to do precisely that, by killing itself faster than it powers its load.
Such an inane power system continually forms a marvelous extractor of vacuum energy, then turns upon itself suicidally. In an oil derrick analogy, the system continually destroys its own energy flow "well head" (source dipole) and does not capitalize upon it. That is rather like drilling an oil well, bringing in a great gusher, catching a little oil in barrels, burning half of the barreled oil to deliberately cap the well, then drilling another well beside the first one, forcibly recapping the second one, and so on.
Since the beginning, every electrical load has been powered by energy extracted directly from the vacuum, and not by the heat produced from all the hydrocarbons burned and nuclear fuel rods consumed, or by the energy from the hydroturbines and waterwheels turned by dams across streams, or by windmill-powered generators, or by solar cells, etc.
Mary Rose
reply to post
If the observations that were made in the original experiments turn out to be incomplete or not quite accurate, the math associated with them will be wrong.
What's important is the experimentation, interpretation, and accurate theory upon which to base the math.
Yes, one experiment is not enough.
My point is that we're evaluating our accepted laws of thermodynamics.
Again, the math that we have is based on interpretation of experiments. If the interpretation was wrong the math will be wrong.
What exactly are they moving and shaking?
Mary Rose
reply to post by Bedlam
Thank you for your well-meaning advice but I'm very content and satisfied with my tutors, who are the movers and shakers of this world who think for themselves and don't accept the mainstream as an authority figure.
boncho
And what about thousands upon thousands?
Mary Rose
boncho
And what about thousands upon thousands?
You missed the point.
The point is how experiments are interpreted.
Thermodynamics is the study of the connection between heat and work and the conversion of one into the other.
This study is important because many machines and modern devices change heat into work (such as an automobile engine) or turn work into heat (or cooling, as in a refrigerator). There are two laws of thermodynamics that explain the connection between work and heat. But first, it must be shown how mechanical energy can be equivalent to heat energy.
Mechanical equivalent of heat
Experiments showed that the amount of heat created is proportional to the work done. This relationship is called the mechanical equivalent of heat and can be expressed by the equation:
W = JH
where
W is the work done in joules (J)
J is the relationship constant 4.18 joules/calorie (J/c).
H is the heat created from the work in calories (c)
Note: A calorie is the amount of heat required to raise the temperature of one gram of water 1°C. It is not to be confused with a Calorie (capital "C") used in dieting.
Mary Rose
Yes, one experiment is not enough.
My point is that we're evaluating our accepted laws of thermodynamics.
Again, the math that we have is based on interpretation of experiments. If the interpretation was wrong the math will be wrong.