18.
Explanation
Physical System:
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A physical system exists in the tangible, real world.
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It comprises physical components like hardware, machinery, or infrastructure.
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Physical systems have a physical presence, and their behaviour is governed by the laws of physics and engineering.
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Examples include an automobile, a manufacturing plant, or a computer.
Abstract System:
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An abstract system is conceptual and doesn't have a tangible, physical presence.
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It consists of logical, mathematical, or conceptual components and rules.
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Abstract systems are used to model and analyse real-world situations, processes, or data.
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Examples include an accounting system, an algorithm, or a decision-making framework.