Pressure Flashcards
1
Q
Define pressure (scalar)
A
It’s the force acting per unit area
2
Q
SI unit of pressure
A
Pa or N/m²
3
Q
Formula for pressure
A
P=F/A
4
Q
Formula for liquid pressure
A
P= ρgh
ρ= density in kg/m³ g= gravitational field strength N/kg h= height in m
5
Q
One pascal is defined as
A
the pressure exerted by a force of 1 newton on an area of 1 square metre.
6
Q
State the 2 properties of liquids that help transmit pressure in a hydraulic system
A
- Liquids are incompressible
2. If pressure is applied to an enclosed liquid, the pressure is evenly transmitted to all parts of the liquid.
7
Q
Formulas for pressure distributed in a hydraulic press
A
F1/A1=F2/A2 or d1A1 = d2A2 (Conservation of volume) or F1d1 = F2d2 (Conservation of Energy)
8
Q
Define atmospheric pressure
A
The weight of air that exerts pressure on the surface of the Earth.
9
Q
Units of Atmospheric pressure
A
Pa or cmHg or mmHg
