Atmospheric pressure is measured as 76cmHg in mercury barometer. Express this

Question

pressure in standard unit (Pa).

Answer 1

To express the atmospheric pressure of 76 cmHg in mercury barometer in standard units (Pascals - Pa), we need to convert it using the relationship:

1 atm = 101325 Pa

1 cmHg = 133.3223684 Pa (approx)

First, we can convert cmHg to mmHg by multiplying it by 10:

76 cmHg = 76 x 10 mmHg = 760 mmHg

Next, we can convert mmHg to Pascals by multiplying it by the conversion factor:

760 mmHg x 133.3223684 Pa/mmHg = 101325.0032268 Pa (approx)

Therefore, the atmospheric pressure of 76 cmHg in mercury barometer is approximately 101325 Pa in standard units.