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P. 4229. The heating system keeps the temperature of a flat at about 20 oC. Outside the weather is cold and damp: the temperature is 0 oC, and the relative humidity is 95%. What will the relative humidity of the air in the room be after airing the room, when the temperature reaches again the value of 20 oC? Approximately what amount of water must be vaporized in a flat of area 50 m2 and of height 3 m, in order to reach the 50% relative humidity, pleasant for the human mucous membrane.

(5 points)

Deadline expired on 10 March 2010.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. A relatív páratartalom 25% lesz a szellőztetés után. Az 50% eléréséhez 6,5 dl vizet kell elpárologtatni.

Statistics on problem P. 4229.
 80 students sent a solution. 5 points: 63 students. 3 points: 3 students. 2 points: 10 students. 1 point: 1 student. 0 point: 2 students. Unfair, not evaluated: 1 solution.

• Problems in Physics of KöMaL, February 2010

•  Támogatóink: Morgan Stanley