# FQ - 2B - 24 de marzo de 2022

FQ - 2B

• repeat last class
• conduction
• convection
•  thermal efficiency
1 / 10
Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 2

In deze les zitten 10 slides, met tekstslides en 1 video.

Lesduur is: 60 min

## Onderdelen in deze les

FQ - 2B

• repeat last class
• conduction
• convection
•  thermal efficiency

#### Slide 1 -Tekstslide

Exam
We finished the theory.

When?

#### Slide 2 -Tekstslide

Repetition
• Thermal expansion + equation
•  L = L0 (1 + α x ΔT)
• Expansion in gases
• Thermal equilibrium
• How much Joules is 1 cal?

#### Slide 3 -Tekstslide

Video
Watch the video and take notes on what's important!

#### Slide 5 -Video

Conduction
The process by which heat is transferred from one point to  another in a solid.

- Thermal conductors: transfer thermal energy quickly.
- Thermal insulators: tranfer thermal energy slowly.

Good thermal conductor has a high thermal conductivity.

#### Slide 6 -Tekstslide

Sea breezes
(convection)

Air on lang becomes less dense as it
heats up and rises. Cooler air from
the sea moves in over the land.

At night it's the opposite effect.

#### Slide 7 -Tekstslide

Radiation is the process of heat transfer by which bodies emit energy that can move through a vacuum.

#### Slide 8 -Tekstslide

Heat transfer by conduction obeys Newton's Law of Cooling

The speed at which heat is transferred by thermal conduction through the walls of a material depends on:
- the difference between the temperatures on either side of the wall
- the area of the walls
- the thermal conductivity of the material used in the walls
- the thickness of the walls

#### Slide 9 -Tekstslide

Let's practise
Make exercises 12, 13, 14, 16, 17, 19, 20, 21 & diagram on page 133

Finished with exercises? Process the theory (mindmap/summary)