particles - types of pressure

Question 1

hydrostatic pressure explanation

Answer 1

the greater the height of the liquid above a certain point, the greater pressure that is exerted

Question 2

pressure equation

Answer 2

pressure = height x density x g
p = hpg

pressure - pascals (n/m^2)
height/depth - metres
density - kg/m^3
g - grav field strength

Question 3

atmospheric pressure explanation

Answer 3

created when molecules collide with surfaces
air is more dense close to the earth’s surface and decreases as you ascend
–> why mountaineers carry oxygen when climbing high

Question 4

differential pressure explanation

Answer 4

when there’s different substances either side of a boundary, the pressure may be different (could be problematic if the difference is big)

e.g.
- if a window were opened on a plane, the contents would be sucked out
- the smallest hole could cause an explosive decompression