"Physics by country" generally refers to the study and practice of physics within specific countries, which may include the following aspects: 1. **Research Output**: Different countries contribute varying amounts of research in physics, often measured by the number of published papers, patents, and citations in scientific journals. Countries like the United States, Germany, China, and the United Kingdom are typically leading in this area. 2. **Educational Systems**: The structure of physics education can vary widely across countries.
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