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What is the difference between metric and imperial? This question often arises when comparing measurements across different countries, especially when dealing with scientific, engineering, or everyday applications. The metric system, also known as the International System of Units (SI), is the most widely used system of measurement worldwide. In contrast, the imperial system, which originated in the British Empire, is still in use in some countries, notably the United States. This article will explore the key differences between these two systems, highlighting their origins, units, and practical applications.