The tube of mercury barometer is 4mm in diameter. How much error does the surface tension cause in
Channel: Doubtnut
Date: 2020-08-02

The tube of mercury barometer is 4mm in diameter. How much error does the surface tension cause in the reading? Surface tension of mercury = `540" cc "10^(-3) Nm^(-1)`, angle of contact = `135^(@)`. Density of mercury `= 13.6 xx 10^(33)kg m^(-3)`.