P2 - Thermal Physics Flashcards
1
Q
What is brownian motion? [2]
A
the random movement of particle after straight line and colliding with other particles
2
Q
What are some differences between evaporation and boiling? [6]
A
- E: no bubble
- B: bubbles throughout liquid
- E: takes place only on surface of liquid
- B: takes place throughout the liquid
- E: occurs at any temperature
- B: boils at specific temperature
3
Q
What are similarities between boiling and evaporation? [3]
A
- both involve liquids changing gases
- both need energy to happen
- both are physical changes
4
Q
What is conduction? [2]
A
vibrating particles transfer energy to neighbouring particles
5
Q
What is convection? [4]
A
- liquids or gases get heated
- gain kinetic energy
- become less dense
- they rise up
6
Q
What is a convection current? [1]
A
repeating cycle of rising and cooling particles
7
Q
What are poor conductors of thermal energy called? [1]
A
insulators
8
Q
What is infrared radiation? [1]
A
radiation that heats up things
9
Q
What is the best absorber and emitter of thermal radiation? [1]
A
MATTE BLACK
10
Q
What are the worst emitters but the best reflectors? [1]
A
SILVER
