1.2 Systems and Models Flashcards
Flow
Part of a systems diagram.
Usually represented by an arrow.
Could be a transfer or a transformation
Could represent the movement of energy or matter.
Input
Part of a systems diagram, usually represented by an arrow transferring or transforming energy or matter into a system.
Output
Part of a systems diagram, usually represented by an arrow transferring or transforming energy or matter out of a system.
Systems Diagram
A visual representation of a system, consisting of arrows (flows) and boxes (stores)
Stores/Storage
Part of a systems diagram.
Where energy/matter accumulates and is stored. Often represented as a box or circle.
Reductionist/Reductionism
analysing and describing a complex phenomenon in terms of its simple or fundamental constituents.
Holistic approach
Considering an environmental phenomenon as a whole, recognizing the interconnections and relatedness of its individual parts.
Transfer
A type of flow involving the transport of either energy or matter without it changing state or chemical composition.
Transformation
A type of flow involving either a change of state or chemical reaction that changes the properties of either energy or matter.
Model
A model is a simplified version of the real thing. We use models as a tool to help us understand how a system works and to predict what happens if something changes.
Open system
A system that allows the flow/exchange of energy and matter between the system and its surroundings/environment
Think of a plant
Closed system
A system that allows the flow/exchange of energy but not matter between the system and its surroundings/environment.
Think of a terrarium
Isolated system
Mostly theoretical. Doesn’t allow the flow/exchange of energy or matter between the system and its surroundings/environment.
Think of a thermos flask (or the cosmos)
