Question

an open tube mercury manometer has a height difference between the columns of -10cm. What are the a) gauge pressure and b) the absolute pressure?

Answer 1

Gamma*h= change in pressure,
So what's the specific weight of mercury and times that by .1meters

Answer 2

whats the formula for gamma?

Answer 3

Gamma is specific weight, look it up in a table. It will be a number with the units of N/m^3

Answer 4

ahhh,,,after getting the pressure? and multipying it by .1 meters? i will now get its gauge and absolute? right?

Answer 5

the specific weight for mercury is 133416 N/m3

Answer 6

Mmm... I probably didn't make it clear before:

Gauge pressure = specific weight of mercury * change in height in meters

Absolute pressure = gauge pressure + atmospheric pressure in pascals

Answer 7

multipied by .1m = 13341.6

Answer 8

it will goe like this,,

gauge pressure = 133416 N/m3 * -.1 m = -13341.6 Pa

absolute pressure = -13341.6 + 101325 Pa = 87983.4 Pa

Answer 9

*goes

Answer 10

can it be negative pa in gauge?

Answer 11

Looks like u did it right
^_^

Answer 12

can it be negative pa in gauge?