Problem P. 4456. (September 2012)

P. 4456. A liquid in glass thermometer, which is at room temperature initially, is put to warm water, and it is observed that the level of the liquid in the thermometer initially decreases one or two degrees, before it begins to increase.

What can the reason of this behaviour be?

(3 pont)

Deadline expired on October 10, 2012.

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

Megoldásvázlat. A cső fala hamarabb melegszik fel és tágul ki, mint a benne levő folyadék.

Statistics:

234 students sent a solution.
3 points:	107 students.
2 points:	76 students.
1 point:	32 students.
0 point:	19 students.

Problems in Physics of KöMaL, September 2012