Specific latent heat Flashcards
1
Q
What is the energy needed to change a state called?
A
- Latent heat
2
Q
What happens when a change of state occurs?
A
- Internal energy changes
- Temperature doesn’t change
3
Q
What is specific latent heat?
A
- Amount of energy required to change 1 kg of a substance with no change in temperature
4
Q
What is the specific latent heat of fusion?
A
- Changing between solid and liquid
- Melting or freezing
5
Q
What is the specific latent heat of vaporisation?
A
- Changing between liquid and gas
- Evaporating, boiling, condensing
6
Q
Formula for specific latent heat:
A
Energy (J) = mass (kg) X SLH (J/kg)
E = m X L
- To work out energy needed or released
7
Q
How do you measure the specific latent heat of ice and of water?
A
- Low-voltage heater to melt ice
- Or boil water
