[Request] Water mix temperature

Hi,

Let's ignore the evaporation, freezing, and temperature dissipation across the medium around (air, enclosure, etc) for a moment.

I have 1 Liter of water at 100°C and 1 Liter of water at 0°C. Sudently I mix them. Will the result be 2 Liters of water at 50°C?

When mixing, is the temperature directly proporcional to the amount of media (water in this case)?

thanks!