Density and pressure

Question 1

What is density?

Answer 1

The mass per unit volume of a material

Objects made from low density materials will have a low mass
Objects made from high density materials will have a high mass

Question 2

What is the equation for densiity?

Answer 2

Density= Mass/Volume

Mass is measured in Kg
Volume measured in m^3
Density Kg/m^3

Question 3

Think of the partciles

Which is more dense a solid or a gas?

Answer 3

Solid

Gases are less dense because there partciles are spread out

Question 4

Can the units for density change?

Answer 4

Yes it depends on what the units for mass and volume are

It depends on what the units for mass and volume are

If the mass is measured in g and volume in cm3, then the density will be in g/cm3
If the mass is measured in kg and volume in m3, then the density will be in kg/m3

Question 5

What is the aproximite density for air (kg/m^3)?

Answer 5

1.3kg/m^3

Question 6

What is the aproximate density for wood (kg/m^3)?

Answer 6

300-800kg/m^3

Depends on the species

Question 7

What is the aproximate density for water (kg/m^3)?

Answer 7

1000kg/m^3

Question 8

What is the aproximate denisty for granite stone (kg/m^3)?

Answer 8

2700kg/m^3

Question 9

What is the aproximate density for lead (kg/m^3)?

Answer 9

11300kg/m^3?

Question 10

How to calculate differnt volumes in a cube, cylinder and sphyere?

Answer 10

Cube:d^3
Cylinder:(pie)r^2 x l
Sphyere:4/3(pie)r^3

The volume is not always given of an object so needs to be calculated