Pressure Flashcards
pressure
air molecules colliding with surface molecules, exerting tiny force
what is pressure dependant on?
contact area and force
pressure equation
P = F x A
larger the area . . .
lower the force
what is created when there’s pressure in fluids?
force normal to fluid surface
pressure in fluids equation
H x density x g
increased depth
increased pressure
upthrust
upward reactant force
does the bottom or top half of a submerged object experience more pressure
bottom
more submersion
more upthrust
float
upthrust = weight
sink
weight > upthrust
buoyancy
ability float
decompression sickness disease
dissolved nitrogen comes out of solution, under high pressure diffuses into bloodstream
why you must return to atmosphere slowly?
so body adjusts to external pressure
atmosphere
thin layer around Earth
higher altitude lower . . .
pressure, less dense of air molecules, less collisions
Magdeburg hemisphere
when air is removed, difference in pressure inner and outer surface, net force
force equation (Magdeburg)
pressure difference x A
kinetic theory
air molecules exert tiny force, random motion
straw
air sucked out, pressure pushed fluid
suction cap
air sucked out, net inward force
door
held by outward force push
