A sharp knife cuts food more easily than a blunt knife because…, Why can people at the back of the room smell perfume?, Water comes out furthest from the bottom hole of a bottle because…, Food colouring spreads faster in hot water than cold water because…, Diffusion happens because…, When more air is pumped into a balloon, the balloon gets bigger because…, What is diffusion?, Why does diffusion NOT usually happen in solids?.

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