ENGGPHYSICS CHAPTER VIII. FLUID STATICS

VARIATION OF PRESSURE WITH DEPTH
UNIT PRESSURE or PRESSURE, P
Pressure is
PASCAL’S LAW
Pascal’s Law
o GAGE PRESSURE (RELATIVE PRESSURE), Pgage
Gage pressures are
o ATMOSPHERIC PRESSURE, Patm
Atmospheric pressure is the
Under normal conditions at sea level:
1 atm = 2166 lb/ft
= 14.7 psi
= 29.9 in. Hg
= 760 mm Hg
= 101.325 KPa
o ABSOLUTE PRESSURE, Pabs


Note: Unless otherwise specified in the problem, the term pressure signifies gage pressure.
VARIATION OF PRESSURE WITH DEPTH IN A FLUID
.
The pressure at any point below the free surface of
a liquid equals the product of the unit weight of the
liquid and the depth of the point.
This