Atmospheric pressure is measured as 76cmHg in mercury barometer. Express this
pressure in standard unit (Pa).
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.