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11501254
Chapter 14- Thermal physics
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Mind Map on Chapter 14- Thermal physics, created by Connor O'Hare on 21/11/2017.
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Connor O'Hare
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Connor O'Hare
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Chapter 14- Thermal physics
The triple point of a substance- "one specific temperature where the 3 phases of matter exist in thermal equilibrium"
Thermal equilibrium- "A state in which there is no net flow of thermal energy between the objects involved"
Objects in thermal equilibrium must be at the same temperature
Zeroth law- "If 2 objects are each in thermal equilibrium with a third, then all 3 are in thermal equilibrium with each other
Celsius scale
°C
Uses triple point of water and absolute zero
Increment change is the same size as the Celsius scale
K=θ°C+273
Absolute scale
Kelvin (K)
Uses 2 fixed points (Boiling water & freezing point of water
100 increments (Between 0°C and 100°C)
The Kinetic model
There are 3 main phases
Solid
Liquid
Gas
Internal energy- "The sum of the randomly distributed kinetic and potential energies of atoms/molecules within the substance
Kinetic energy is determined by the temperature of the susbstance
Forces of attraction between particles determines potential energy (This is always negative)
Specific heat capacity
"The energy required per unit mass to change the temperature by 1K/1°C
Jkg^-1K^-1
c=E/(m*Δθ)
Water has exceptionally high specific heat capacity
Specific latent heat
"The energy required to change the phase per unit mass while at constant temperature"
L=E/m
A substance still requires energy to change phase even when at its melting or boiling point.
Specific latent heat of fusion (Lf)
Solid--> Liquid
Specific latent heat of vapourisation (Lv)
Liquid--> Gas
For this to occur the other way the substance must transfer the latent heat energy to its surroundings
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Thermal Equilibrium (binary/octet-stream)
957516997 (binary/octet-stream)
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