Density And Pressure Flashcards
What is density
The mass of an object divided by its volume
How to work out the density of plasticine
Mass: use a top pan balance Volume: 1) make a cuboid, use v= l x w x h 2) displacement in a measuring cylinder 3) displacement using a eureka can
How to ensure measuring the density of plasticine is accurate
Read measuring cylinder at eye level
Measure from the bottom of the meniscos
Place on level surface
Density of salt water
1.2g/cm3
What is pressure
Pressure is the measure of a concentration of a force acting over an area
Pressure formula
Pressure = force/area
How to explain a pressure
1) identify the force (weight or push)
2) area = large or small
3) pressure = large or small
4) what happens
Explanation of pressure of liquids/gases
When going deeper in a liquid, the pressure increases, as there is more weight of water above
Pressure difference equation
Pressure difference = height x density of the liquid x gravitational field strength
(Gravitational field strength = 10 N/kg)
Atmospheric pressure
100 000Pa