Question

What is mean by: "pressure of gas is 13.6cm of Hg"?

Answer 1

Hey there,

The statement means at sea level mercury barometer reads 13.6cm. 

Answer 2

Answer:

• The gas pressure is the actual force can be exerted by gas on the walls of container that is stored.
• This gas pressure is measurable by using the barometer and the pressure measured is called the barometric pressure.
• It is expressed as ‘mm of Hg’ or ‘millimeters of mercury’. This barometer is filled with mercury as a standard and hence used as a comparison.
• The standard atmospheric pressure of 760 mm in height exerted when the mercury density is 13.6 cm of Hg.
• So the pressure of any gas is the pressure exerted by it on the walls of the container that can rise the mercury to 13.6 cm in the barometer.