What will the barometer show if it is immersed in water to a depth of 40 centimeters?

If the barometer is immersed in water to a depth of 40 centimeters, then it should show and show the pressure p = rgh = 1000 * 10 * 0.4 = 4000
Pascals and mercury barometer will increase by 4000 / 133.3 = 30



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