theremodyamics

Question 1

1st law of thermodynamics

Answer 1

energy cannot be created or destroyed

Question 2

2nd law of thermodynamics

Answer 2

heat is transferred from one body to another body
only if the two bodies are at different temperatures,
the heat flows from the body at the highest temperature to the body at the lowest temperature

Question 3

3rd law of thermodynamics

Answer 3

the entropy of a system approaches a constant value as the temperature approaches absolute zero

Question 4

conduction (solid)

Answer 4

vibrating particles transfer energy to neighbouring particles.

kinetic energy from heat - particles vibrate faster coliding with other particles to evenly distribute heat.

Question 5

thermal conductivity

Answer 5

metals - high
plastics - low
fluids - low

Question 6

convection (fluids)

Answer 6

particles gain kenetic erergy - move faster

random diffusio causes energetic particles to move to cooler area

particles left in warmer region are spread out causing the fluid to expand - less dense

Question 7

conduction vs convection

Answer 7

both particles gain kenetic energy

conduction - energy is transfered
convection - particles move

Question 8

radiation

Answer 8

energy is carried by infared waves (travel through a vaccum)

Question 9

Q = mcΔT

Answer 9

heat energy
mass
specific heat capacity
change in temp