density and pressure

define density

mass per unit volume of a substance

what is the formula for density

p = m / v

p = density

m = mass

v = volume

how would you calculate the density of a regular shaped solid

measure the mass of the regular shape solid

measure the length, height and width

multiply them altogether to find the volume

use the formula to find the density

mass / volume

how would you calculate the density of an irregular shaped solid

weigh the mass of the irregular shaped solid

get eureka can and fill it up with water

gently place the irregular shaped solid into the Eureka can and collect the water that comes out using a measuring cylinder.

That measuring cylinder water represents the volume of the object/

Use the formula of density mass/ volume

define pressure

force per unit area

waht is the unit for force

p = f / a

p = pressure

f= force

a= area

what is the key principle of pressure in liquids and gases

pressure acts equality in all directions becuase of the particles randomly moving making them collide with he surface

for example a balloon

what is the formula for pressure difference

p = h x p x g

p = pressure

greek p = density

h = height

g = gravity (9.8 if the question deosn’t specify)