Question

name two substances which contract on heating and write range of temperature​

Answer 1

Answer:

water between 0-40C and gallium

Answer 2

Substances which contract on heating:

1. Water ⇒ 0°C to 4°C
2. Silver iodide ⇒ 80°C to 141°C

Explanation:

• When a material/substance is heated, the heat energy subjects the atoms to vibration.
• The vibration usually leads to formation of space between atoms and expansion of the substance. But some material leads to contraction when subjected to heating.
• This is due to the unique crystal structure of a material and this property of the material is termed as negative thermal expansion.
• The contraction of the substance occurs only in narrow range of temperature.
• When there is contraction, the atomic structure of the material is eventually redesigned.