Conduction Convection and Radation

Heat energy

​LAWS!

-Energy cannot be greated or destroyed-
-Heat energy always travels from the hot substance, to the cold (known as one of the laws of Thermodynamics)
-Heat energy is the result of moving particles- the greater the movement, the greater the space needed- this is why hot objects tend to expand

Multiple Choice

True or false? The reason why a glass feels cold is because the cold energy travels towards your hand

• true

• false

Temperature

​The average Kinetic Energy of the particles

in more common terms, the hotness or coldness of a substance
It can be measured in Celsius or Farenheit. Other scales exist too. The scientific scale is known as the Kelvin scale.
All three of these scales were named after famous scientists.

Match

Match the first name with the last name

• Anders

• Daniel

• William

Celsius

Farenheit

Thompson

(Lord Kelvin)

• Celsius

• Farenheit

• Thompson

  (Lord Kelvin)

Heat passing from one material to another. In the experiment we did, copper was found to be a very good conductor or heat

​

​Heat Transfer: Conduction

​Particles that are warmer, rise, whereas particles that are cooler fall, producing this cycle motion

​Heat transfer: Convection

It is believed that the convection currents in the Earth's mantle causes the plates on which continents stand, to move and slide past one another, causing volcanic activity and earthquakes

​

​Real life convection currents

Multiple Choice

The reason why air conditioners should be placed at the top of a room is?

• the hot air will rise and the aircon will cool it

• the cold air from the aircon will fall because it is less dense

• the cold air with rise because it is more dense

• it doesn't matter where they are placed

Multiple Choice

If the conversion from Celsius to Farenheit follows this formula $$\left(C\times\frac{9}{5}\right)+32=F$$ what is 30⁰C in F?

• 90°F
• 75°F
• 100°F
• 86°F

Last but not least...Radiation

​How does the sun's heat reach us?

Radiation does not need a medium to be passed on
Conduction needed metal particles
Convection needed liquid or gas particles
Radiation needs no particles, it uses electromagnetic waves- these are alternating magnetic and electric fields

Match

Match the term with its description

• heat moving through solids

• heat moving through gas or liquids

• heat travelling without the need of matter

conduction

convection

radiation

• conduction

• convection

• radiation

Insulation

​the ability of substances to control heat flow

Also known as thermal insulators
-they can work by either trapping air- bubble wrap
-they can work by reflecting heat- aluminium foil
-they are made from materials that are poor conductors, like polystyrene, wool, fibre glass, double glazing

Categorize

Options (14)

copper

brass

stainless steel

wool

foil

air

iron

silver

gold

nickel

rubber

glass

plastic

wood

Place each substance in the correct category

Conductors

Insulators