Page 11 - E-Science Prim.6 2024-2025 U2_Handy

Bridges Engineers use

Bridges are made of steel expansion joints to keep
and concrete. In hot,
metal temperature bridges safe over time
“expand / contract”
increases, spaces increase, “Bending while expanding”
molecules spread and
expand.

Railroad tracks

Railroad tracks are made of
iron. Engineers leave

small spaces between them
to allow tracks to expand in

hot without bending to
avoid accidents

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First Term