Module 2 - heat - paragraph 2 theory (heat transfer)

• Science
• Middelbare school
• havo, vwo
• Leerjaar 1

Module 2 - heat - paragraph 2 theory (heat transfer)

We divide heat transfer in three categories:

1. Convection

2. Conduction

3. Radiation

Deeper understanding: simulation of particles

Your teacher will show you a computer generated
particle model that explains why hot fluids (liquids and gases) rise.

In your notebook:

1. Draw two squares that are identical in size.

2. Label one HOT and label one COLD

3. You will draw dots to represent particles in the boxes

4. Draw particles in the boxes. One of the boxes will have particles closer to each other. Which one?

What happens to the particles of a substance when they are heated?

1. Particles move faster, so they get close to each other.
2. The particles slow down and move closer to each other.
3. The particles slow down and away from each other.
4. Particles move faster, so they bump each other away a bit.

If you have 1 liter of hot water and 1 liter of cold water, which one will be heavier?

1. Cold water
2. Hot water
3. They have the same mass
4. A mix of both

1 liter of cold water is heavier. Why?

- Particles tend to move slower when the substance is colder.

- Particles will be able to stay closer to each other, since they don't bump each other away as much.

- A specific volume (1L) of colder water will fit more particles in it, so it is heavier. 

WHY IS THIS RELEVANT FOR CONVECTION?

Name some insulators:

What kind of heat transfer causes the sun to heat our planet?

IR camera experiment

Your teacher will try to show you an infrared camera.

What is correct?

1. 1=Convection. 2=Conduction. 3=Radiation.
2. 1=Combustion. 2=Conduction. 3=Convection.
3. 1=Conduction. 2=Convection. 3=Radiation.
4. 1=Radiation. 2=Conduction. 3=Combustion.

The person in the middle is having a bad time. Why?

What kind(s) of heat transfer are happening here?

To do

Read paragraph 2 if you are stuck in any exercises.

Do exercises of paragraph 2.