I think that when two substances of different temperatures are in contact, an equilibrium scenario occurs. Remember that heat is a type of movement and energy. When two substances are in contact, let’s say a cold substance and a warm substance, there are particles in the cold substance that bump into the particles of the warm substance to give them energy, but this is less likely, and happens less than the event of a particle of the warm substance bumping into the cold substance and transferring more energy. This means that an equilibrium is reached at a lower temperature than if you used a slightly warmer cool substance. Temperature will reach an equilibrium like this, and will have a lower overall temperature at the end, because the overall temperature in the beginning was colder. I think also, that the rate of this reaching of equilibrium may be increased by lower temperature substances, because the probability that heat will transfer to rather than away from the cold substance. It’s far more likely. Another thing to take into account is specific heat capacity. If something is just naturally and usually colder in the open air, this could relate to its specific heat capacity. Something such as a metal would need more heat to make it warm, and therefore would decrease the equilibrium overall temperature at the end of a temperature equalization of two substances. Any of these reasons would seem logical in the case of two substances of different temperatures. I have actually used specific heat capacity in a lab, and know that it definitely plays a huge role in this kind of occurrence. I think it is also important to consider that there is a difference in rate of shift and gravity of shift. I belief that rate of shift is affected by the separation in temperature, and that gravity of shift is affected both by separation in temperature and by specific heat capacities of the two substances.
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