Question

Name the substance which has negligible expansion on heating

Answer 1

Answer:

Invar and quartz fused glass shows negligible expansion on heating

Answer 2

The substance which has negligible expansion on heating is Invar.

• Many substances expand on heating such as many metals, oil, water, gases such as hydrogen, N2 and co2,
• Expansion occurs because of their decrease in density and increase in volume.
• The density of a substance decreases because heat increases the kinetic energy of a substance.it increases the temperature of the substance.
• If the substance is present in a fixed volume then there is no expansion and increases in temperature cause an increase in pressure.
• Iron expands while brass contracts on heating.