Why do solids and liquids expand when heated?

Answer 1

Objects expand when heated because the heat 'gives' molecules more energy, so they move around more. This vibration, as molecules are pushed further apart, is manifested as a larger volume. An exception is water, which contracts as it cools until you reach about 3.98 ° C then starts to expand as it cools more. This is caused by the shape of water molecules. Then again, there is Zirconium Tungstate which contracts as it is heated up to 800o C (an effect caused by lattice formation that twists and turns individual molecules).

Answer 2

When you add energy (heat) the molecules and atoms want to spread further apart and there is thus greater space between them. This results in an increase in volume (expansion) while the mass remains constant and the density reduces.

Answer 3

the solid will melt as it expand on heating

Answer 4

Solids molecules start vibrating more thus causing it to get bigger. the heat gives the molecules energy to vibrate more

Answer 5

The heat shows up as increased molecular (particle)motion. The particles vibrate more vigorously and push apart. This causes expansion.

Answer 6

cos they feel like it