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Flashcards in Heat Deck (14)
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1
Q

What is convection

A

Transfer of heat through Liquids and gases. Liquid and gas particles are free to move. Particles with more kinetic energy move from hotter regions to cooler regions, taking their thermal energy with them

2
Q

What is heat

A

It is a form of energy

3
Q

Latent heat

A

Causes a change in state and not a change in temperature heat is lost

4
Q

Explain materials reaction to temperature change

A

Expand when heated and contact when cooled

5
Q

What is conduction

A

Is the transfer of heat through a solid. Vibrating particles pass on extra kinetic energy (or heat) to neighbouring particles.

6
Q

Insulators

A

Are materials that are poor conductors of heat

7
Q

Explain radiation

A

The transfer of heat in rays from a hot object without needing a medium to pass through

8
Q

What is the difference between heat and temperature

A

Heat is a form of energy and measured in joules

Temperature is a means of measuring hot and cold and is measured in celcius

9
Q

What does hot water do

A

Rise

10
Q

What surfeces absord and radiate heat better

A

Dark surfaces

11
Q

Explain what happens to water at 4 degrees

A

If you heat water above 4°C it will expand.
If you cool water below 4°C it will expand.
Above 4°C water behaves like other liquids.
Below 4°C water behaves oppositely to other liquids.

12
Q

Why does a larger amount of water stay hotter than a smaller amount of water at the same temperature

A

A small volume of boiling water has the same temperature as a large volume full of boiling water. The large volume of boiling water has much more energy so stays warm longer

13
Q

Why did the copper rods pin fall off first in the experiment To show the transfer of heat energy by conduction in solids

A

Copper is the best conductor of heat and melted the vaseline

14
Q

Explain convection currents

A

The rising and falling of particles with more/less thermal energy results in a convection current