Suppose a constant volume of water is being heated up by a constant amount of power. After some time it is noted that the rate of change of temperature is slowing down. (In this scenario, assume all temperatures to be between 10 and 90 degrees Celcius) What would cause this non-linear relationship between time and temperature? Q = mc(delta)T --> This does not take into account the masses current temperature. Does it have to do with energy loss of the substance to outer environment?