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As can be seen, because water has the largest latent heat of any known fluid, the greatest part of the heat received by the steam is required to evaporate it and this occurs at constant temperature. However, the gas stream temperature continuously decreases as it transfers heat to the steam. Accordingly, the evaporating temperature of the steam must be very much lower than that of the initial gas stream temperature and in this case, despite the relatively high initial temperature of the gas stream, the steam cannot evaporate at temperatures much above 120 ◦C.