Density and Pressure
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8 Terms
equation for density
density = mass/volume
equation for pressure
pressure = force/area
equation for pressure difference
pressure difference =
height x density x gravitational field strength
density
density is the mass per unit volume
density tells us how tightly the particles are packed together.
measured in kg/m3 or cm/m3
describe an experiment to measure the density of an irregular solid
fill water into a displacement can until it is overflowing.
wait for water to drip out of displacement can spout.
weigh the object using scales
pace the object in displacement
catch the drips from the spout in a measuring cylinder.
calculate density of the object:
density = mass/volume (of water caught in cylinder
pressure
pressure is a measure of how spread out/concentrated a force is.
(pressure is ‘force per unit area’)
Pressure in liquids and gases…
pressure acts in all directions
pressure increases with depth
in gases and liquids at rest, the pressure at any point acts equally in all directions.
the same force applied over a larger area…
creates a lower pressure
