EDU | SCIENCE | EVERYTHING on Instagram: "🌡️ Walter Lewin Demonstrates the Concept of Thermal Expansion • Thermal expansion is the tendency of materials to change size with temperature. • As materials heat up, particles move faster and push each other apart. • Cooling causes materials to contract, reducing their dimensions. • Walter Lewin’s demonstration visually shows how heat affects solids and liquids. • This principle is crucial in engineering, construction, and daily life. • Bridges, railw