Heat against temperature against internal energy, the scales and the −40 coincidence, the zeroth law, conduction, convection and radiation, and the three thermometers MEC names side by side.
Unit 2 carries 7 of the 50 physics marks; with six chapters sharing them, this one averages a little over one (MEC publishes weights by unit, not by chapter). It is the cheapest chapter in the unit to secure: two of its three scope points are definitions, and the third is a single comparison table that the syllabus asks for by name.
The MEC scope lines are: Concept of thermal energy, heat and temperature; Modes and laws of heat flow: zeroth law and Stefan–Boltzmann law; Liquid-in-glass, resistance and radiation thermometers: principle, advantages and limitations. The headings below are those points, in MEC's order.
Three ways it is asked: recall (the value of Stefan's constant, what the zeroth law states, the useful range of an alcohol thermometer); understanding (why a body owns internal energy but never "heat", why a good absorber must be a good emitter, why a radiation pyrometer cannot read the temperature of a cup of tea); application (a conduction rate through a slab, what happens to radiated power when the absolute temperature doubles, a Newton's-law-of-cooling time, a temperature read off a platinum resistance).
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See the plansHeat and Thermodynamics: Unit Map and Reading Order
What the Heat and thermodynamics unit covers, how many of the 50 Physics questions it carries, and the order to read its six chapter notes in.
Thermal Expansion: One Coefficient, Three Dimensions
Why α : β : γ is 1 : 2 : 3, how a hole and a bimetallic strip behave, why a pendulum clock loses time in summer, and the real-against-apparent expansion of a liquid in its vessel.
Quantity of Heat: Mixtures, Latent Heat and the Triple Point
Heat capacity against specific heat capacity, the method of mixtures done cleanly, latent heats and the heating curve read properly, evaporation against boiling, and the triple point of water.
Ideal Gas: Where Pressure and Temperature Come From
The kinetic-theory assumptions, P = ⅓ρc̄² and what it proves, the three molecular speeds and their ratio, energy as (3/2)k_BT per molecule, degrees of freedom, and C_p − C_v = R.