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Physics > Heat > Flashcards

Heat Flashcards

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1
Q

Heat

A

Form of energy

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2
Q

The unit of energy is the

A

Joule(J)

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3
Q

Solids, liquids and gas expand

A

When heated

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4
Q

Solids, liquids and gas contract

A

When cooled

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5
Q

Bimetallic Strip

A

The different metals will expand and contract at different rates due to their different molecular properties

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6
Q

Conduction

A

Heat travels from particle to particle along a substance, normally a solid

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7
Q

Convection

A

Heat travels through a fluid (liquid or a gas) when the particles move and carry heat

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8
Q

Radiation

A

Heat travels from a hot object without the need for medium, does not need a solid, liquid or gas to go through a vacuum

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9
Q

Conductor

A

Something that allows energy e.g. heat to flow through it. E.g. metal is a good conductor

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10
Q

Insulators

A

Materials that are poor conductors of heat

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11
Q

Heat can travels in 3 different methods

A

Conduction, convection and radiation

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12
Q

When heat changes a liquid to a gas with no temperature change

A

We call it latent heat of vaporisation

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13
Q

When heat changes a solid to a liquid with no temperature change

A

We call it latent heat of fusion

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14
Q

When heat causes a change in state and not a change in temperature

A

We call it latent heat

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15
Q

Temperature is a measure of the

A

hotness of a body and the unit is the degree Celsius (C).

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16
Q

Increasing pressure raises the boiling point of water

A

above 100°C

17
Q

Reducing pressure lowers the boiling point of water

A

below 100°C.

18
Q

Below 4°C water behaves

A

oppositely to other liquids.

19
Q

Above 4°C water behaves

A

like other liquids.

20
Q

Radiation

A

Radiation is the transfer of heat from a hot object without the need of a medium
The sun transfers its energy by radiation

21
Q

Temperature

A

A measure how hot an object is

22
Q

Temperature is measured

A

By a thermometer

23
Q

We deal with 2 types of thermometer

A

Mercury thermometer and alcohol thermometer

24
Q

The liquid in the thermometer will

A

Expand and rise when heated and will contract and fall when cooled

25
Q

Temperature is measured

A

Between 0 and 100 degrees Celsius

26
Q

Melting point

A

Is when a solid turns to a liquid

27
Q

Boiling point

A

Is when a liquid turns to a gas

28
Q

Freezing point

A

Is when a liquid turns to a solid

29
Q

Condensation

A

Is a gas turning to a liquid

30
Q

Latent heat

A

The heat taken in or given out when a substance is changing state without a change in temperature

31
Q

Latent heat of fusion

A

Is used when a solid changes into a liquid

32
Q

Latent heat of vaporisation

A

Is used when a liquid changes to a gas

Physics (7 decks)

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