Mercury Barometer?

Question

Is the head of pressure (the distance from Mercury in tube to the level of mercury in bowl) taken for atmospheric pressure or the whole lentgh of mercury column(below the mercury in bowl) is taken for measurement? If u have any doubt about question inform it through answer i will email the proper question to u

So what is the zero error in it

Answer 1

dear, only length of mercury (or any other liquid) , from the upper surface of liquid in bowl to the height in the tube is taken. zero error is taken in to account when high accuracy is required.

Answer 2

The distance from Mercury in tube to the level of mercury in bowl balances atmospheric pressure. Below the level of the mercury in the bowl, the level inside the tube is balanced by the level outside the tube.

Answer 3

it is the head u gotta take

because the part inside the bowl does not make any difference
when atmospheric pressure applied it makes the mercury rise in the tube u should take the length above the mercury level

Answer 4

From the top of the meniscus of the mercury in the tube to the top of the meniscus in the bowl is the exact height of mercury to be taken.
The pressure of the atmosphere is the force acting on the total SURFACE area of the mercury in the bowl that maintains the head of mercury in the tube.
+ or - about 1% error.

Answer 5

The distance you measure is from the top of the mercury in the tube down to the surface of the mercury in the bowl.

Answer 6

The column is filled with mercury and placed into a bowl of mercury. The atmospheric pressure changes the column height to what the atmosphere's pressure. It should be arounf 760 mm Hg at normal elevation.