SOLIDS, LIQUIDS AND GASES- density and pressure Flashcards
density equation
density= mass/ volume p= m/ v
measuring density of irregular solids
EUREKA CAN
1) fill water to bottom of spout
2) gently lower solid in can and catch displaced water in a higher resolution of measuring cylinder
3) measure mass of object on top pan balance
4) use mass/volume equation
5) add units (probably g/cm3)
density in liquids
1) weigh mass of empty measuring cylinder on top pan balance
2) measure desired water volume in measuring cylinder
3) weigh mass of water on TPB (minusing the MC)
4) use p= m/v equation
NOTE= at higher temperatures, the density will usually be lower, however at lower temperatures the density is lower because the water is ICE
density bottle
1) use known density liquid to find volume (eg water 1g/cm3)
2) weigh mass of empty density bottle
3) fill bottle, put on stopper
4) weigh bottle minus empty density bottle mass
5) use density equation m/p
solid pressure
pressure= force exerted/ area of surface in contact
force= in Newtons area= cm2 or m2 pressure= N/cm2 or N/m2 (1Nm2= 1 Pa)
pressure of irregular solids
1- draw around object on sq paper 2- count squares inside area 3- times no. of squares by area of 1 square 4- measure weight in newtons 5- use equation pressure= force/ area
pressure difference equation
pressure = h x p (density) x g
atmospheric pressure experiment
remove air inside can using vacuum pump
1- BEFORE= molecules hit inside/ outside of can with equal pressure
2- AFTER= pressure from outside crushes can because no/ barely any molecules are pushing out from inside
MAGDEBURG SPHERES
use pump to take air out to make vacuum
pressure in liquids
pressure= force/ area pressure= 10 x depth x density (N/m2) = (N/Kg) x (m) x (Kg/m3) -pressure is greater deeper because the weight of the fluids above is greater -pressure increases with depth -PRESSURE ALSO DEPENDS ON... =density of liquid = pull of gravity (g= 10N/Kg)
