A barometer with a brass scale correct at 0^(@)C reads 70 cm of mercury on a day when the air temperature is 40^(@)C. The correct reading at 0^(@)C is (Coefficient of real expansion of mercury is 0.00018//^(@)C and the coefficient of linear expansion of brass is 0.000018//^(@)C.

A barometer with a brass scale correct at 0^(@)C reads 70 cm of mercur

1.	A barometer with a brass scale correct at 0^(@)C reads 70 cm of mercury on a day when the air temperature is 40^(@)C. The correct reading at 0^(@)C is (Coefficient of real expansion of mercury is 0.00018//^(@)C and the coefficient of linear expansion of brass is 0.000018//^(@)C.
Answer» SOLUTION :`69.55 CM`