Question

8. The tube of a mørcury barometer is 1 cm in diameter. What
correction due to capillarity is to be applied to the barometric
height? [Surface tension of mercury = 485.5 dyn/cm, density of
mercury = 13.6 g/cm', contact angle of mercury and glass - 135°)​

Answer 1

What correction due to capillarity with effect of miniscus is to be applied to barometer reading if surface tension of mercury is 435.5 dyne/cm and angle of contact of mercury with glass is 140°? (density of mercury = 13600 kg/mº) (Ans: 1.001 mm)