Model Answers
Q: What is the limitation of the "Particle Model - Conduction" animation?
A1: The spacing between the particles does not increase when the solid is heated. In reality the spacing between particles increases and this results in the expansion of solids when heated.
A2: Even before the match is lit the solid has some heat (unless it is cooled to absolute zero, -273degC!) so there would be some vibration of the particles. As heat spreads through the solid the vibration increases.
Q: What's the mistake in the description of convection in the "Cooking using Conduction, Convection and Radiation" animation?
A: The mistake is in this sentence
The molecules DO NOT shrink when cool! The space between the molecules gets less as the molecules have less Kinetic Energy.
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