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... more energy will be required to raise the temperature of it by a fixed temperature. And if there is a small volume of water, less energy will be required to raise the temperature by the same value. This is because when there is more water, there are more water particles that have to be provided with energy so that they move around quicker. But when there is less water there are less water particles, so not as much energy has to be inputted to make the particles move around. Distance between burner and can - when there is a larger distance between the two, the alcohol will have to release more energy to raise the temperature of water by a certain temperature because there will be more heat loss in the air between the burner and can. When the burner is closer, less energy is released to raise the temperature ...