Chapter 14

Thermal Physics

KS5 p14.1 temperatures

Triple Point of Water.mp4

Triple point of water

What the kelvin is calibrated too.

Celsius Didnt Invent Celsius.mp4

History of celcius

edited to useful parts.

Triple point of water :

  • gas, solid, and liquid all at once. at 0.01 ℃ @ 0.61 kPa

KS5 p14.2 solids liquids and gases

Freezing Water Time Lapse 2.mp4

Starter ...

Why does water freeze top down? (Density)

Pollen Grains in Water - Brownian Motion.mp4

Brownian motion


1 pager solution to problem

One pager solution to the solid problem

Practical

Demo :

  • Hot water vs cold water
  • Potassium permanganate

Demo to show brownian motion - decribe what is happening on a molecular level as the students observe the hot water / cold water difference.

Practical:

Risk

Risk:

  • Staining with Potassium permanganate

KS5 p14.3 internal energy

1 pager

KS5 p14.4 specific heat capacity

Practical

Demo :

Practical:

5 x the following

  • 1x Aluminium cube (200g or fits in the beaker)
  • 1x Water bath set at known temperature (thermometer)
  • 1x cooking oil or salter water or anything thats available
  • 1x beakers (to fit the cubes)
  • 1x thermometers
  • 1x tonges to handle metal block
  • 1x balance

Practical :

Students will work out the specific heat capacity of the liquid that the aluminium is placed in. With the aluminium block at thermal equalibrium in the water bath, it is then dropped into the unknown liquid. When thermal equilibium is reached the following calculations can determin the SHC of the liquid.

cliquid =( mblock x cblock x tempdiffblock) ÷ (mliquid x tempdiffliquid)

Risk

Risk:

  • Hot metal blocks
  • spillage of hot water

KS5 p14.45 specific heat capacity

Practice QUESTIONS

Practice QUESTIONS Answers

Markus Kayser - Solar Sinter Project.mp4

KS5 p14.5 specific latent heat

Practical

Demo :

  • Looking for a metal to make molten. If we had Gallium that would be perfect but perhaps I am thinking zinc but need input from Nate

The plan is to take a metal from a solid to a liquid in the lab. Using a bunsen I can talk through the changes showing the graph. The demonstration is followed by calculation practice.

Risk

Risk:

  • Hot metal


KS5 p14.55 - Specific Latent heat

Practical

Demo :

Practical:

5 x the following

  • 1x Power supply
  • 1x Voltmeter
  • 1x Ammeter
  • 1x Heater
  • 1x Large funnel
  • 1x thermometer
  • 1x Ice
  • 1x balance

Practical :

Students will work out the specific latent heat of ice. By placing a heater in the middle of the ice, the students should be able to measure the energy going into the ice (must start at zero degrees not colder), and the mass of the ice.

Risk

  • Hot heater (should be operated at low voltages)

Exam

Answers