Chapter 14 - Thermal physics Flashcards
What is the experimemt to prove brownian motion in a lab?
- Smoke in a glass jar
- Brightly illumianted
- Look under a microscope
- Bright specks will move haphazardly
Why does the brownian experiment support random motion?
‘Invisible’ air particles hit the smoke particles causing them to move randomly
How does energy change during phase change?
Internal energy changes
Kinetic energy will stay the same
What is internal energy?
Total electostatic potential and kinetic energy
How do you convert from degrees celcius to Kelvin?
Add 273
What is the energy of a particle at 0K?
The minimum possible internal energy
How does brownian motion support the theory of random motion?
Particles change direction so must be acted on by a force
The force is ueven and random which matches the force caused by random motion
How do you use the method of mixtures?
The energy lost by one object will be equal to that gained by the other
You can equate the two specific heat capacity equations
What is the specific latent heat?
The energy needed per KG to go from a solid to a liquid
What is the specific latent heat of evaporation?
The energy needed per KG to go from a liquid to a gas
