Eshan
Last Activity: 6 Years ago
Hotter body means higher temperature. Temperaure, actually, is a measure of kinetic enregy of the particles comprising the body. So a high temperature body has particles with higher energy(constantly colliding among themselves) in contact with those of lower temperature body.
Consider this more as a statistical phenomenon- a bunch of highly energetic, colliding among itself system in contact with colder particles. The collision of high energy particles now with lower energy ones would result in the momentum transfer to the cold ones and resultantly, the earlier colder atoms gain the kinetic energy and hence higher temperature., On the other hand, the hotter particles now lose their energy through momentum transfer and thus the temperature of the hotter body decreases.