IB Physics HL B.1.7 Thermal transfer direction
IB Physics HL B.1.7 Thermal transfer direction

IB Physics syllabusFirst assessment 2025
Decide whether thermal energy flows or not by comparing temperatures and identifying when a system has reached thermal equilibrium.
How this is tested
- use the temperature difference to decide net transfer direction, not mass or thermal capacity
- state that readings are taken after waiting so the system reaches thermal equilibrium and temperature is constant
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