Consider Object A which has a temperature of 70°C and Object B which has a temperature of 20°C. The objects are placed right next to each other.
Now, as far as i know, the temperature is defined as the average kinetic energy of the particles in a system. Again, as far as i know, there are particles colliding inside, resulting in a range of different speed and hence kinetic energy.
So if we are talking about the average kinetic energy, that means there are some high kinetic energy particles in object B (which has a lower temp) and there are some low kinetic energy particles in object A (which has a higher temp) right? If so, couldn't the high temp particles in object B transfer some of its kinetic energy to object A, resulting a temperature change?