How is heat propagated in solids and liquids?

In liquids, heat is primarily transferred via convection. Say you boil a kettle of water, the water molecules at the bottom gain thermal energy the fastest and so expands, causing it to be less dense. It rises and the cooler, denser water molecules sink to the bottom forming what we call a convectional current. The process then continues. read more

Liquids have thermal conductivity of below 1 W/mK except liquid mercury while most of the solids have higher k value than unity. So you can say heat transfer rate is more in solids than that of liquid most of the time. read more

Like solids, liquids and gases are also capable of heat transfer by thermal conduction. But the extend of conduction is less compared to solids. This tutorial discussing about how conduction heat transfer carried out in liquids and gases with the governing formulas. read more