Question

what is called if the length of the solid expands when heated ? ​

Answer 1

Answer:

When the solid is heated, the heat which is also a form of energy is gained by the atoms of the solids and this heat energy is transferred to adjacent atoms of the solids by the neighboring atoms. ... Hence, the solids on heating expands due to increase in kinetic energy of the atoms

Explanation:

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Answer 2

Thermal expansion is the increase, or decrease, of the size (length, area, or volume) of a body due to a change in temperature.