Density and pressure Flashcards

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1
Q

What is density?

A

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

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2
Q

What is the equation for densiity?

A

Density= Mass/Volume

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

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3
Q

Think of the partciles

Which is more dense a solid or a gas?

A

Solid

Gases are less dense because there partciles are spread out

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4
Q

Can the units for density change?

A

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

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5
Q

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

A

1.3kg/m^3

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6
Q

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

A

300-800kg/m^3

Depends on the species

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7
Q

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

A

1000kg/m^3

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8
Q

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

A

2700kg/m^3

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9
Q

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

A

11300kg/m^3?

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10
Q

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

A

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

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