Thermal Physics Flashcards Preview

Physics - AQA A Level > Thermal Physics > Flashcards

Flashcards in Thermal Physics Deck (16):
1

Internal energy

Energy of its molecules due to their individual movements and positions

2

Internal energy increases

If work is done on the object
If energy is transferred to it

3

If internal energy stays constant

No energy transfer
Energy transfer by work done and heat transfer cancels out

4

First law of thermodynamics

ΔInternal energy = energy transfer due to work done or heating

5

Internal energy is the sum of...

Random distribution of the kinetic and potentials energies of its molecules

6

Thermal equilibrium

No thermal heat transfer

7

Absolute zero

Where a substance has minimum internal energy

8

Specific heat capacity

Energy required to raise the temperature of a unit of mass by 1K

9

Inversion tube experiment

GPE → thermal energy
nmgh → mcΔT

10

Measuring specific heat capacity using electrical methods

Electrical energy → thermal
IVt → mcΔT

11

Latent heat

Where heating results in no temperature change during a change in state

12

Latent heat of fusion

Energy required to melt a solid

13

Latent heat of vapourisation

Energy required to vaporise a liquid

14

Which tends to require more energy; melting or vaporising?

Vaporising

15

Latent heat of sublimation

Energy required to heat a solid to its gas

15

Latent heat equation

Q = ml

Q - energy required
m - mass
l - specific latent heat