Question

If a barometer at your home reads 768.2mm of Hg,what is the pressure in kPa?

Answer 1

If a barometer at our home reads 768.2 mm of Hg, we have to find the pressure in Kilo Pascal.

solution : reading of barometer at our home is 768.2 mm Hg

we know, 1 atm = 760 mm Hg

and 1 atm = 1.013 × 10⁵ Pa

so, reading of the barometer at our home in atm = 768.2/760 atm = 1.01078947 atm ≈ 1.011 atm

now reading of the barometer at our home in Pascal = 1.011 × 1.013 × 10⁵ Pa

= 1.024143 ≈ 1.024 × 10⁵ Pa

we know, 1kpa = 10³ Pa

= 1.024 × 10² kpa

= 102.4 kpa

Therefore the reading of the barometer at our home in kpa is 102.4