Grade 6 | Science | Unit 2 - Concept 1 - Lesson 6 - Thermal Expansion - bridges and railroad tracks
Автор: Mr. Raouf Ashraf
Загружено: 2025-12-15
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Engineers use some techniques to protect bridges and railroad tracks from expansion or contraction in different conditions of weather.
Examples :
1 In bridges
• Most bridges are made of steel and concrete.
• When the temperature increases in hot weather or decreases in cold weather, the metal that makes up bridges expands and contracts.
• So, engineers use expansion joints to keep bridges safe over time.
2 In railroad tracks
• Railroad tracks are made of iron.
• Engineers leave small spaces between the railroad tracks to allow these tracks to expand in hot weather without being bent to avoid train accidents.
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Mr. Raouf Ashraf
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