Thermal physics Flashcards Preview

BMAT: Physics > Thermal physics > Flashcards

Flashcards in Thermal physics Deck (15):
1

describe particle arrangement for solids

- dense structure
- strong forces of attraction in fixed, regular arrangement
- vibrate around fixed positions

2

describe particle arrangement for liquids

- weaker forces of attraction
- close together but move past each other ini irregular arrangement
- more energy than solids

3

describe particle arrangement for gases

- less dense than liquids/solids
- almost no forces of attraaction
- fre to move at high speeds in random motion

4

what are three forms of heat transfer?

- conduction
- convection
- radiation

5

what is conduction?

vibrating particles pass extra kinetic energy onto neighbouring particles

6

example of good conductor

metals - contain free electrons

7

give examples of insulators

- non-metals
- gases

8

how is rate of conduction affected?

- how quickly heat is transferred by conduction
- state of material
- conducting ability
- surface area
- temp difference

9

what is convection?

particles move from hotter region to cooler region and take heat energy with them

10

how is convection current formed with radiator?

hot air from radiator rises because it is less dense and displaces cooler air
- cooler air falls which is denser and flows to fill gap from rising hot air

11

how do you reduce convection?

use insulation which traps air so air can't move

12

how is radiation different to convection and conduction?

doesn''t require a medium
- infra red EM wave

13

what type of surfaces absorb radiation more

dark

14

what type of surfaces reflect radiation

silvered

15

what is a colloid

substance microscopically dispersed evenly throughout another substance