Why do weather people use barometric pressure in inches of mercury? compare to milimeters of mercury? how is p

Question

this is my essay question

Answer 1

Well millimeters is too small and you have to develop a extremely long tube of mecury to measure equal pressure like in inches of mecury.

Answer 2

As a weather person, I would like to clarify something.  We do NOT use Inches of Mercury (inHg) to measure the pressure.  That is only used by TV people and the aviation industry.

We use a unit called millibars or Hectopascals.  

People just use inHg because the first barometers were literally a column of mercury that was measured with a ruler.  The column would grow when the pressure was higher.

It's just become tradition to use it and the aviation industry still holds to it.  But rest assured, we "weather people" do not use it.  :)