A hot air balloon achieves itsbuoyant lift by heating the air inside the balloon, which makes itless dense than the air outside.  

Suppose the volume ofa balloon is 1800m3and the required lift is 2700N. Calculate the temperature of the air inside the balloon which willproduce the required lift. Assume that the outside airtemperature is 0*C and that air is an ideal gas under theseconditions. What factors limit the maximum altitudeattainable by this method for a given load? (Neglect variables likewind.)


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