As something gets warmer, it begins to increase the vibration and movement of the molecules that it consists of. In solids, particles are closely packed together and are in direct contact. Since they are close to each other, particles that vibrate near the point of contact will pass on the vibrations to other particles nearby. The vibrations spread throughout the object. Conduction works similarly with liquids and gases, but since the density of the particles is less, there will be less efficient energy transfer between the molecules. Conduction occurs when 2 things at different temperatures touch each other and energy directly goes one object to the next from the material in the hotter object to the material in the colder object at the point of contact.
