Between 3200 and 3600 m/s, the closer together the particles are in a substance are, the faster sound can travel through it. This is why these values are much higher than the 343 m/s, the speed of sound in air.
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the speed of sound of water at 25 degrees centigrade is 1497 m/s.
There is no such temperature.
Probably a worn or loose belt
Curtains help absorb sound waves, whereas sound waves bounce off solid walls, so a curtained room will be more quiet.
The speed of sound through gases isn't very specific. However, if you mean through air it is roughly 330m/s the air is about 78% nitrogen, so i would guess it would be about the same figure through nitrogen.