Density And Pressure Flashcards

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1
Q

What is density

A

The mass of an object divided by its volume

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2
Q

How to work out the density of plasticine

A
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
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3
Q

How to ensure measuring the density of plasticine is accurate

A

Read measuring cylinder at eye level
Measure from the bottom of the meniscos
Place on level surface

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4
Q

Density of salt water

A

1.2g/cm3

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5
Q

What is pressure

A

Pressure is the measure of a concentration of a force acting over an area

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6
Q

Pressure formula

A

Pressure = force/area

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7
Q

How to explain a pressure

A

1) identify the force (weight or push)
2) area = large or small
3) pressure = large or small
4) what happens

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8
Q

Explanation of pressure of liquids/gases

A

When going deeper in a liquid, the pressure increases, as there is more weight of water above

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9
Q

Pressure difference equation

A

Pressure difference = height x density of the liquid x gravitational field strength

(Gravitational field strength = 10 N/kg)

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10
Q

Atmospheric pressure

A

100 000Pa

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