A glass tube sealed at one end and containing a quantity of air is immersed in mercury until the sealed end is 10 cm from the surface of mercury. At `0^(@)C` the level of mercury in the tube is 5 cm above the level of mercury in the vessel. The length of the tube is 15 cm. To what temperature should the air in the tube be raised as to fill the tube completely? The atmospheric pressure is 75 cm of Hg. Neglect any change in the level of mercury in the vessel.

Explanation

`663^(@)C`