The process in the problem is an endothermic process.
It is an endothermic process since the substance that is submerged in the water is going to consume the energy and heat of its surroundings and in an endothermic process that happens, resulting in that its surroundings are going to have less heat.
The opposite of this process would be the exothermic process, in which there is a transfer of energy from the substance to its surroundings, which would increase the temperature around it, which does not happen in the statement.
The magnitude that will measure these energy flows is called enthalpy, this is if these processes occur at a constant pressure. This magnitude represents this exchange of energy between the system and its surroundings, as in the example of the substance that is submerged in water.
Therefore, we can confirm that the process in the problem is an endothermic process.
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