What will happen if the hot water is heated to a very high temperature?
Teacher: If the hot water is heated to a very high temperature then some of the water will be lost due to evaporation and so the mass of the hot water contributing in the experiment will be inaccurately known. The second reason is that when the hot water is being mixed to the cold water some heat will be lost due to the radiation which is not accounted in the formula. Higher is the temperature of hot water above room temperature more is the loss of heat due to radiation. So to minimize the loss of water and heat the temperature of the water is not kept very high. Student: What will happen if the hot water is taken in a thermos flask and cold water is taken outside? Teacher: If the hot water is taken inside the flask then its temperature will not change significantly before mixing. During mixing, calorimeter will also loose heat. The formula will have to be modified. Student: While plotting the graph of temperature versus time should we start the temperature scale from 0oC? Teacher: The
