Question

6. Metal bridges are built with expansion joints because in the summer:- (1 Point) the hot metal evaporates. metal contracts in the Sun. the metal in the bridge may increase in size. some metal can reach melting point.​

Answer 1

Answer:

The metal in the bridge may increase in size

Explanation:

Due to the heat provided by the sun, the Kinetic energy of the metal atoms increase which leads to more excited behavior of atoms and this causes expansion of metals when they are heated

Answer 2

Metal bridges are built with expansion joints because in the summer the metal in the bridge may increase in size.

• We leave spaces between sections of a bridge or two consecutive sets of railway tracks to allow for thermal expansion.
• The major reason for this expansion is the increase in kinetic energy of molecules of a metal bride due to excessive heat.
• If no spacing is left, the rails will bend sideways due to summer expansion. Train accidents will occur as a result of this.