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What describes the first law of thermodynamics?

The first law of thermodynamics states that energy can neither be created nor destroyed, only altered in form. For any system, energy transfer is associated with mass crossing the control boundary, external work, or heat transfer across the boundary. These produce a change of stored energy within the control volume.

Which of the following defines the first law of thermodynamics quizlet?

The First Law of Thermodynamics can be written as (Delta)E = q +w. This means that all changes in energy for a macroscopic body must equal the sum of the energy transferred by heat and the energy transferred as work. Further, since E is a state function (Delta) E must be the same for any path.

What are the consequences of the Second Law of Thermodynamics?

One of the most important implications of the second law is that it indicates which way time goes – time naturally flows in a way that increases disorder. The second law also predicts the end of the universe: it implies that the universe will end in a “heat death” in which everything is at the same temperature.

Is heat a state function?

Heat and work are not state functions. Work can’t be a state function because it is proportional to the distance an object is moved, which depends on the path used to go from the initial to the final state.

How is Entropy a state function?

Entropy is surely a state function which only depends on your start and end states, and the change in entropy between two states is defined by integrating infinitesimal change in entropy along a reversible path. But heat Q is not a state variable, the amount of heat gained or lost is path-dependent.

What is state diagram example?

A state diagram shows the behavior of classes in response to external stimuli. Specifically a state diagram describes the behavior of a single object in response to a series of events in a system. Sometimes it’s also known as a Harel state chart or a state machine diagram.

How do you do a state diagram?

Steps to draw a state diagram –

  1. Identify the initial state and the final terminating states.
  2. Identify the possible states in which the object can exist (boundary values corresponding to different attributes guide us in identifying different states).
  3. Label the events which trigger these transitions.

How do you write a state diagram?

State Diagram The binary number inside each circle identifies the state the circle represents. The directed lines are labeled with two binary numbers separated by a slash (/). The input value that causes the state transition is labeled first. The number after the slash symbol / gives the value of the output.

What are the components of a state diagram?

State diagram symbols and components

  • Choice pseudostate. A diamond symbol that indicates a dynamic condition with branched potential results.
  • Event. An instance that triggers a transition, labeled above the applicable transition arrow.
  • Exit point.
  • First state.
  • State.
  • Terminator.
  • Transition.
  • Trigger.

What is purpose of state diagram?

The primary purpose of a statechart diagram is to model interactive systems and define each and every state of an object. Statechart diagrams are designed to capture the dynamic behavior of an application system. These diagrams are used to represent various states of a system and entities within the system.