Density and Pressure Flashcards
What is the equation to find density?
Density = mass
———
Volume
What is the symbol for density?
p (rho)
What is mass measured in?
Kg or g
What is volume measured in?
M3 or cm3
What is density measured in?
Kg/m3
How do you find the mass?
Regular or irregular
Use scale to weigh it
How do you find volume?
Regular- l x w x h
Irregular- fill beaker with water
Put in object
Level of water - level before
Liquid- 1cm3 = 1mlWhat is pressure?
Tells us how much force is exerted over a certain area
What is the equation to find pressure?
Pressure = force
——–
Area
What is pressure measured in?
N/m2 or Pa (pascals)
What is force measured in?
N
What is area measured in?
M2 or cm2
What is pressure in liquids called?
Hydrostatic pressure
What is the equation to find hydrostatic pressure?
Pressure= density x depth x gravity P = p x h x g N/m2 = kg/m2 x m x N/kg
What is gravity on earth?
10N/Kg
Pressure…with depth.
Increases
Pressure at a…depth does…depend on…
Pressure at a given depth does not depend on vessel shape or amount of liquid
Pressure acts in…
All directions
Pressure on a…always acts…to its…
Why?
Pressure on a submerged object always acts perpendicularly to its surface
Molecule colliding with surface of object
Pressure is…through a liquid
Why?
Liquid
Liquid particles very closely packed, any pressure applied must be very high to force them together
Cannot be easily compressed, so pass on force
Pressure…with density
Increases
Particles collide with…
This can exert a…if…
One another and walls
Significant force
Many molecules
Molecules in air regularly change…
Their…appears…
Speed and direction
Motion
Random
Pressure caused by…(…particles)…exerting a pressure on us
Weight of the atmosphere
Air
Acting on our area
