Mathematical and Physical Journal
for High Schools
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# Problem P. 4229. (February 2010)

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 pont)

Deadline expired on March 10, 2010.

Sorry, the solution is available only in Hungarian. Google translation

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

### Statistics:

 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