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A block of aluminium is heated electrically by a 25W heater. If the temperature rises by 10°C in 5minutes, the heat capacity of the aluminium is
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is
In a good thermos flask, the main cause of heat loss is
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