Density and pressure

Question 1

Density=?

Answer 1

Mass/volume

Question 2

mass=?

Answer 2

density x volume

Question 3

pressure=?

Answer 3

force/area

Question 4

pressure difference =?

Answer 4

height x density x gravitational field strength

Question 5

density of air

Answer 5

1.3 kg/m cubed

Question 6

density of water

Answer 6

1000 kg/m cubed

Question 7

density of iron

Answer 7

8000 kg/m cubed

Question 8

conversion from g/cm cubed

Answer 8

kg/m cubed x 1000

Question 9

method of measuring density of a regular object

Answer 9

measure mass on balance, measure length width and height with a ruler, repeat in different places to check it’s regular…density = mass/volume

Question 10

method for measuring density of irregular object

Answer 10

measure mass on balance, fill displacement to spout, slowly lower object (avoid splashing), volume of water displaced = volume of object displaced, transfer water to measuring cylinder, measure on a flat surface to the bottom of the meniscus at eye level (avoids parallax error)

Question 11

definition of pressure

Answer 11

the ratio of force to the area over which it acts

Question 12

if depth is doubled, what happens to the pressure?

Answer 12

it doubles too