In one glass, water is poured at a temperature of 100 ° C, and in the other 90 ° C.

In one glass, water is poured at a temperature of 100 ° C, and in the other 90 ° C. Where is the internal energy greater and why, if the mass of water is the same?

Internal energy depends on the amount of heat transferred to the water.
The amount of heat depends on the water temperature: Q = C * m * T, where C is the heat capacity of water, J / (kg * oC); m is the mass of water, kg; T – water temperature, K. Obviously, other things being equal, the internal energy of water in the first glass is greater than in the second, since the water temperature in the first glass is higher.