When things are very hot do they contract or expand?

Generally things expand when heated and contract as they cool.

Sometimes, when things get colder (such as ice at certain temperatures), bonds form that actually push the molecules apart a bit. This causes expansion while cooling (or contraction while heating, as these bonds break), but this is never the case for a very wide range of temperatures. It's also certainly the exception and not the rule. Most bonds actually bring molecules closer together as they form.

This means that if you cool ice which starts at it's melting temperature, it thermally contracts; then starts to expand for a bit, then starts to contract again, and continues to contract until it reaches absolute zero (at which point you of course cannot cool it further.

generally expand because the molecules are vibrating very fast from the heat. Just like how solid->liquid->gas. The volume expands because the movement of the molecules get stronger and stronger

Expand when heated, Contract when cooled. Hope that helped ;)

Heat causes things to expand. (except ice)

if they are very hot then they expand; but if u r thinking of water then there is little different case.

expand

Usually expand.

Well in order from hot to cold, it goes, gas then liquid then solid. So if it was hotter than normal, it would expand cause the particles move further apart.

expand

They expand when heated then contract as they cool.