Pressure Flashcards
Define density
Density of a substance is its mass per unit volume
Describe pressure of hydraulic press
Input pressure equals output pressure
What is Pascal’s Principle
Pascal’s Principle is that pressure is transmitted equally to all other parts of the fluid if external pressure is applied to an enclosed fluid
Define pressure
Pressure is force acting per unit area
How to increase pressure
- Increase force
- Decrease contact area
What properties does a hydraulic press make use of
- Liquids are incompressible
Pressure is transmitted equally to all other parts of the fluid wen external pressure is applied to enclosed fluid
What does it mean by a liquid finds its own level
- Liquid levels at equilibrium are at the same height
- Pressure is equal at any point along same vertical height
What is 1atm equal to
76 cm Hg
1000 cm H2O
What is atmospheric pressure
Atmospheric pressure is the force due to molecular bombardment by energetic air molecules on us in all directions
What happens when there is pressure difference on the same body
Net force acts in direction of region of higher pressure to region of lower pressure
What happens to difference in liquid length when diameter of U tube in manometer increases
Remains the same
What happens to difference in liquid length when more liquid is poured into manometer
Remains the same
