The air pressure in the thermometer bulb at constant volume is 70 cm of mercury at 0^@C, 90 cm of mercury at 100^@C and 80 cm of mercury at room temperature T. Find the value of T.

The air pressure in the thermometer bulb at constant volume is 70 cm o

1.	The air pressure in the thermometer bulb at constant volume is 70 cm of mercury at 0^@C, 90 cm of mercury at 100^@C and 80 cm of mercury at room temperature T. Find the value of T.
Answer» Solution :As `P PROP T` or `T prop P` ` therefore (T - T_0)/(T_100 - T_0) = (P - P_0)/(P_100 - P_0) = (80 - 70)/(90 - 70)` `(T - 0)/(100 - 0) = 10.20 RARR T = 10/20 xx 100` `T = 50^@C`