5a P1 density and pressure 5d LM Flashcards
1
Q
what is density?
A
the mass per unit volume of a material
2
Q
how do you measure the density of an object?
A
- measure the mass of the object on a digital balance, note mass
- use a ruler or callipers to measure the dimensions of the object
- repeat and take an average
then calculate density
3
Q
how do you measure the density of an irregular object?
A
- place the object on a digital balance, note mass
- fill a eureka can with water to below the spout
- carefully place object in can
- measure the volume of displaced liquid water in the measuring cylinder
- repeat measurements
4
Q
how do you measure the density of liquids?
A
- place empty measuring cylinder on balance, note mass
- fill with liquid and note down the volume
- note down the new reading on the digital balance
- repeat
the mass is the cylinder with water - cylinder
the volume is the reading on the measuring cylinder
5
Q
what is pressure defined as?
A
the concentration of a force or the force per unit area
6
Q
what is pressure in a liquid like?
A
the fluid will exert pressure evenly across the whole surface and in all directions
7
Q
why is pressure like that in a fluid?
A
because when the object is immersed in fluid it will exert pressure, squeezing the object
